{
  "apiVersion": 1,
  "kind": "work-order",
  "purpose": "Taking the firearm apart for a job such as refinishing, and putting it back together to specification.",
  "firearm": {
    "slug": "smith-wesson-mp15",
    "name": "Smith & Wesson M&P15",
    "manufacturer": {
      "id": "smith-wesson",
      "name": "Smith & Wesson"
    },
    "category": "rifle",
    "action": "gas-operated-direct-impingement",
    "calibers": [
      "5.56x45mm NATO",
      ".223 Remington"
    ],
    "alsoKnownAs": [
      "M&P15 Sport II"
    ],
    "coversAlso": [],
    "page": "firearms/smith-wesson-mp15.html",
    "bundle": "api/v1/firearms/smith-wesson-mp15.json",
    "lastUpdated": "2026-10-29"
  },
  "notices": [
    "Smith & Wesson limits owner disassembly: Field strip: upper and lower receivers separated, bolt carrier assembly and charging handle out; handguard removal described but noted as not generally necessary."
  ],
  "disclaimer": {
    "headline": "Read this before you use anything here.",
    "points": [
      "This is a guide, not an authority. Entries are compiled from manufacturer manuals, technical manuals, published references, and community knowledge. Some of it comes from sources that are not authoritative, and some of it may simply be wrong.",
      "Always consult the manufacturer's manual for your specific firearm and serial-number range. Manufacturers change designs mid-production without renaming the model. The manual that shipped with your firearm outranks anything on this site.",
      "Consult a licensed gunsmith for anything beyond routine field stripping and cleaning, for any firearm you are unsure about, and for any procedure marked as gunsmith-recommended here.",
      "Treat every firearm as loaded. Verify it is unloaded, with the magazine removed and the chamber physically and visually checked, before any procedure in this database. Point it in a safe direction the entire time.",
      "Disassembly can damage a firearm or injure you. Springs are under tension, parts can launch, and reassembling a firearm incorrectly can make it unsafe to fire in a way that is not obvious from the outside. If a reassembled firearm does not pass a function check, stop and see a gunsmith.",
      "Torque values are shown in two groups. Values from the manufacturer or the issuing military are shown as such, with the document they came from. Values reported by anyone else — parts makers, gunsmithing publishers, articles, forums — are shown separately with who said them, how reliable that source is, and their exact words. Those are not specifications. Confirm any torque value with the manufacturer or a licensed gunsmith before relying on it.",
      "Nothing here is legal advice. Firearms law varies by country, state, and city, and some modifications or configurations are regulated or prohibited. You are responsible for knowing and following the law where you are.",
      "No warranty of any kind. Contributors and maintainers accept no liability for damage, injury, or loss arising from use of this material."
    ],
    "page": "disclaimer.html",
    "legal": {
      "summary": "Legal notice: this material is third-party information compiled from sources of varying reliability and is provided for general informational and educational purposes only. It is not gunsmithing, technical, safety or legal advice, it is not verified or endorsed by any manufacturer, and it must not be taken as fact. Any work on a firearm beyond the routine field stripping described in its own owner's manual should be performed only by a licensed and insured gunsmith. You use this material entirely at your own risk. Fundamental Build LLC and the project's contributors make no warranty of any kind and accept no liability for death, injury, damage or loss arising from its use. Full terms: LEGAL.md.",
      "page": "legal.html",
      "notice": "https://github.com/Fundamental-build-LLC/Pew-Takedown/blob/main/LEGAL.md"
    }
  },
  "sourcing": {
    "confidence": "high",
    "verification": "armorer-manual-verified"
  },
  "manufacturerDisassembly": {
    "status": "limited",
    "limit": "Field strip: upper and lower receivers separated, bolt carrier assembly and charging handle out; handguard removal described but noted as not generally necessary.",
    "statement": "S&W tells owners never to disassemble beyond the field strip in the manual or perform maintenance not specified. Its service policy excludes damage from not following the disassembly instructions.",
    "source": {
      "title": "Safety & Instruction Manual for Centerfire Semi-Automatic Rifles including Volunteer Series & Sport Series (p/n 3015611, REV S&W_M&P_CF_MSR_REV_022724, © 2024), linked from smith-wesson.com/products/mp-15-sport-iii",
      "publisher": "Smith & Wesson",
      "reliability": "primary",
      "url": "https://smith-wesson.canto.com/direct/document/s9hki7flkd0ar8802osm6p5j75/l-npJQUqV1KM75UlvNhw1q3siAA/original?content-type=application%2Fpdf",
      "page": "29",
      "pdfPage": 29,
      "pageUrl": "https://smith-wesson.canto.com/direct/document/s9hki7flkd0ar8802osm6p5j75/l-npJQUqV1KM75UlvNhw1q3siAA/original?content-type=application%2Fpdf#page=29",
      "quote": "WARNING: NEVER DISASSEMBLE YOUR FIREARM BEYOND THE DISASSEMBLY/FIELD STRIPPING PROCEDURE DETAILED IN THIS MANUAL"
    }
  },
  "recalls": [],
  "shopTier": {
    "tier": 2,
    "group": "rifle",
    "rating": "Pew-Takedown editorial rating (1 easy – 3 hardest), not the manufacturer's",
    "reason": "A mil-spec-pattern AR-15, so it has the same full-strip traps as the AR-556: captive pivot and takedown detents, the buffer retainer, the selector detent, roll pins, and a hammer spring that only goes one way.",
    "confidence": "high",
    "partCount": {
      "value": 131,
      "kind": "line-items",
      "covers": "stand-in: Colt AR15-A2 Sporter (civilian semi-automatic AR-15, same mil-spec AR-15 receiver/bolt/fire-control pattern as the M&P15) per the Gun Digest exploded drawing legend, keys 1-131, complete rif",
      "basis": "publication-diagram",
      "source": {
        "title": "The Gun Digest Book of Exploded Gun Drawings (975 isometric views) — Colt 'AR15-A2 Sporter Autoloading Rifle'",
        "publisher": "Gun Digest Books / Krause Publications (scan on archive.org)",
        "reliability": "secondary",
        "url": "https://archive.org/download/the-book-of-exploded-gun-drawings-975-isometric-views/The%20Book%20of%20Exploded%20Gun%20Drawings%20-%20975%20Isometric%20Views.pdf",
        "page": "book p. 578 (PDF page 579)",
        "pdfPage": null,
        "pageUrl": null,
        "quote": "131 Magazine Bottom Plate"
      }
    },
    "painPoints": [
      {
        "issue": "The front pivot-pin detent and spring launch during install without a pivot-pin tool.",
        "during": "reassembly",
        "source": {
          "title": "DIY AR-15 Build: Pivot Pin Installation",
          "publisher": "ITS Tactical",
          "reliability": "secondary",
          "url": "https://www.itstactical.com/?p=10638",
          "page": null,
          "pdfPage": null,
          "pageUrl": null,
          "quote": "WARNING: The Pivot Pin Spring and Detent can launch out during this section and if you lose them you’d better have good eyes or you’ll be ordering replacements!"
        }
      },
      {
        "issue": "A reversed hammer spring looks seated but does not detent the trigger pin.",
        "during": "reassembly",
        "source": {
          "title": "(Gunsmithing the AR-15 #2) The 30-Second AR Check",
          "publisher": "Gun Tests",
          "reliability": "secondary",
          "url": "https://www.gun-tests.com/?p=26007",
          "page": null,
          "pdfPage": null,
          "pageUrl": null,
          "quote": "A hammer spring installed backwards will give a light primer strike causing misfires, and although it may appear to be laying on and detenting the trigger pin, it in fact will not."
        }
      },
      {
        "issue": "S&W stops the owner at the extractor. Anything further is factory or gunsmith work, so there is no maker procedure for the lower.",
        "during": "both",
        "source": {
          "title": "Safety & Instruction Manual for Centerfire Semi-Automatic Rifles including Volunteer Series & Sport Series (p/n 3015611, REV S&W_M&P_CF_MSR_REV_022724, © 2024), linked from smith-wesson.com/products/mp-15-sport-iii",
          "publisher": "Smith & Wesson",
          "reliability": "primary",
          "url": "https://smith-wesson.canto.com/direct/document/s9hki7flkd0ar8802osm6p5j75/l-npJQUqV1KM75UlvNhw1q3siAA/original?content-type=application%2Fpdf",
          "page": null,
          "pdfPage": null,
          "pageUrl": null,
          "quote": "CHANGES NOT COVERED IN THIS MANUAL OR IN A SMITH & WESSON INSTRUCTION SHEET WILL REQUIRE A QUALIFIED GUNSMITH (OR FACTORY-TRAINED PERSONNEL) USING FACTORY-AUTHORIZED PARTS."
        }
      }
    ],
    "minutes": {
      "strip": 45,
      "rebuild": 70,
      "basis": "estimated",
      "note": "Full AR strip, same scope as the AR-556.",
      "source": null
    },
    "stripScope": [
      {
        "assembly": "Upper",
        "removes": [
          "handguard / delta ring or rail",
          "gas block and gas tube",
          "front sight (if fitted)",
          "flash hider",
          "forward assist",
          "ejection port cover and pin"
        ],
        "tools": [
          "armorer's wrench"
        ]
      },
      {
        "assembly": "Bolt carrier group",
        "removes": [
          "firing pin retaining pin",
          "firing pin",
          "cam pin",
          "bolt",
          "extractor pin, extractor, spring",
          "ejector roll pin, ejector, spring"
        ]
      },
      {
        "assembly": "Lower",
        "removes": [
          "buffer, buffer spring, buffer retainer and spring",
          "castle nut / stock",
          "pistol grip (selector detent and spring)",
          "selector",
          "hammer, trigger, disconnector and springs",
          "bolt catch roll pin, bolt catch, plunger, spring",
          "magazine catch",
          "trigger guard roll pin",
          "front pivot pin and detent",
          "rear takedown pin and detent"
        ],
        "tools": [
          "roll pin punches",
          "vise block"
        ]
      }
    ],
    "hardware": {
      "pins": 22,
      "springs": 22,
      "detents": 9,
      "basis": "counted by name in the same legend (line items). Pins: 3, 5 cam, 6 firing pin retaining, 15, 18 extractor pins, 29, 32, 36, 42, 45, 52, 66, 69 front sight taper pins, 80, 86, 95, 101, 110, 113, 114 ta"
    },
    "specialTools": [
      {
        "tool": "AR armorer's wrench",
        "usedFor": "Castle nut, muzzle device"
      },
      {
        "tool": "vise blocks",
        "usedFor": "Receivers"
      },
      {
        "tool": "roll pin punches",
        "usedFor": "Bolt catch, trigger guard, gas block pins"
      },
      {
        "tool": "pivot pin detent tool",
        "usedFor": "Front pivot pin detent"
      }
    ],
    "fitOnRebuild": [
      {
        "check": "Hammer spring orientation and pins flush",
        "why": "A reversed spring will not detent the trigger pin.",
        "source": {
          "title": "(Gunsmithing the AR-15 #2) The 30-Second AR Check",
          "publisher": "Gun Tests",
          "reliability": "secondary",
          "url": "https://www.gun-tests.com/?p=26007",
          "page": null,
          "pdfPage": null,
          "pageUrl": null,
          "quote": "Hammer spring is correctly installed with both legs horizontal, spread out against inside wall of receiver, and laying on top of trigger in properly in the at pin’s outboard groove, acting as a detent for same."
        }
      },
      {
        "check": "Function check (safety, trigger reset, feeding, extraction)",
        "why": "Standard after any detail strip. No single source.",
        "source": null
      },
      {
        "check": "Re-zero sights or scope",
        "why": "Sights and optics come off for coating, and point of impact must be re-confirmed. This is a standard check, so no source.",
        "source": null
      }
    ],
    "assessed": "2026-10-29"
  },
  "videos": [
    {
      "title": "Field Stripping Your Modern Sporting Rifle",
      "url": "https://www.youtube.com/watch?v=zo-Le55Osqw",
      "platform": "youtube",
      "embedUrl": null,
      "shows": [
        "field-strip",
        "cleaning"
      ],
      "appliesTo": "M&P15 (per description: 'a M&P®15 Modern Sporting Rifle')",
      "published": "2021-07-06",
      "note": null,
      "channel": {
        "id": "UCakTOTSU6hhiSG_vU5P6Kww",
        "name": "Smith & Wesson",
        "url": "https://www.youtube.com/@SmithAndWessonInc",
        "owner": "Smith & Wesson Inc. (manufacturer)"
      },
      "accessed": "2026-10-15"
    }
  ],
  "configurations": [],
  "tools": [],
  "phases": [
    {
      "id": "clear",
      "title": "Clear and make safe",
      "steps": [
        {
          "n": 1,
          "instruction": "Point the muzzle in a safe direction and keep your finger off the trigger."
        },
        {
          "n": 2,
          "instruction": "Press the magazine release and remove the magazine.",
          "partsFreed": [
            "Magazine"
          ]
        },
        {
          "n": 3,
          "instruction": "Pull the charging handle fully to the rear and lock the bolt back with the bolt catch."
        },
        {
          "n": 4,
          "instruction": "Visually inspect the chamber and magazine well, then physically feel the chamber to confirm it is empty.",
          "warning": "Check the magazine well as well as the chamber — a round can hang up there."
        },
        {
          "n": 5,
          "instruction": "If the hammer is cocked, place the selector on SAFE."
        },
        {
          "n": 6,
          "instruction": "Remove all live ammunition from the work area."
        }
      ],
      "videos": []
    },
    {
      "id": "disassemble",
      "title": "Disassemble",
      "videos": [
        {
          "title": "Field Stripping Your Modern Sporting Rifle",
          "url": "https://www.youtube.com/watch?v=zo-Le55Osqw",
          "platform": "youtube",
          "embedUrl": null,
          "shows": [
            "field-strip",
            "cleaning"
          ],
          "appliesTo": "M&P15 (per description: 'a M&P®15 Modern Sporting Rifle')",
          "published": "2021-07-06",
          "note": null,
          "channel": {
            "id": "UCakTOTSU6hhiSG_vU5P6Kww",
            "name": "Smith & Wesson",
            "url": "https://www.youtube.com/@SmithAndWessonInc",
            "owner": "Smith & Wesson Inc. (manufacturer)"
          },
          "accessed": "2026-10-15"
        }
      ],
      "procedures": [
        {
          "procedure": "field-strip",
          "title": "Field Strip",
          "level": "field-strip",
          "configuration": false,
          "steps": [
            {
              "n": 1,
              "instruction": "Complete the Clear and Make Safe procedure and release the bolt forward."
            },
            {
              "n": 2,
              "instruction": "Push the rear takedown pin from the left side until it stops in its captured position.",
              "tip": "If tight, tap it with a punch or a case rim rather than levering it."
            },
            {
              "n": 3,
              "instruction": "Pivot the upper receiver forward on the front pivot pin."
            },
            {
              "n": 4,
              "instruction": "Push the front pivot pin out to its captured position and separate the upper from the lower receiver.",
              "partsFreed": [
                "Upper receiver assembly"
              ]
            },
            {
              "n": 5,
              "instruction": "Pull the charging handle partway rearward and withdraw the bolt carrier group.",
              "partsFreed": [
                "Bolt carrier group"
              ]
            },
            {
              "n": 6,
              "instruction": "Pull the charging handle down and out of its channel.",
              "warning": "The charging handle comes out after the carrier, never before.",
              "partsFreed": [
                "Charging handle"
              ]
            }
          ]
        }
      ]
    },
    {
      "id": "refinish",
      "title": "Refinish",
      "components": [
        {
          "name": "Upper receiver assembly",
          "procedure": "field-strip",
          "level": "field-strip",
          "step": 4
        },
        {
          "name": "Bolt carrier group",
          "procedure": "field-strip",
          "level": "field-strip",
          "step": 5
        },
        {
          "name": "Charging handle",
          "procedure": "field-strip",
          "level": "field-strip",
          "step": 6
        }
      ],
      "manufacturerPartsList": null,
      "partsDiagrams": [
        {
          "title": "Model and features identification (labelled photos of the rifle)",
          "source": {
            "title": "Safety & Instruction Manual for Centerfire Semi-Automatic Rifles including Volunteer Series & Sport Series (p/n 3015611, REV S&W_M&P_CF_MSR_REV_022724, © 2024), linked from smith-wesson.com/products/mp-15-sport-iii",
            "publisher": "Smith & Wesson",
            "reliability": "primary",
            "url": "https://smith-wesson.canto.com/direct/document/s9hki7flkd0ar8802osm6p5j75/l-npJQUqV1KM75UlvNhw1q3siAA/original?content-type=application%2Fpdf",
            "page": "12–15",
            "pdfPage": 12,
            "pageUrl": "https://smith-wesson.canto.com/direct/document/s9hki7flkd0ar8802osm6p5j75/l-npJQUqV1KM75UlvNhw1q3siAA/original?content-type=application%2Fpdf#page=12",
            "quote": null
          }
        }
      ],
      "materials": [
        {
          "component": "Receiver (upper/lower)",
          "material": "ALUMINUM",
          "finish": null,
          "appliesTo": "M&P15 Sport II, 16in, SKU 10202",
          "note": null,
          "source": {
            "title": "Smith & Wesson M&P15 Sport II — product specifications, SKU 10202",
            "publisher": "Smith & Wesson Brands, Inc.",
            "reliability": "primary",
            "url": "https://www.smith-wesson.com/product/m-p-15-sport-ii",
            "page": null,
            "pdfPage": null,
            "pageUrl": null,
            "quote": "FRAME MATERIAL … ALUMINUM"
          }
        },
        {
          "component": "Barrel",
          "material": "4140 CM",
          "finish": null,
          "appliesTo": "M&P15 Sport II, 16in, SKU 10202",
          "note": null,
          "source": {
            "title": "Smith & Wesson M&P15 Sport II — product specifications, SKU 10202",
            "publisher": "Smith & Wesson Brands, Inc.",
            "reliability": "primary",
            "url": "https://www.smith-wesson.com/product/m-p-15-sport-ii",
            "page": null,
            "pdfPage": null,
            "pageUrl": null,
            "quote": "BARREL MATERIAL … 4140 CM"
          }
        },
        {
          "component": "Whole firearm",
          "material": null,
          "finish": "BLACK",
          "appliesTo": "M&P15 Sport II, 16in, SKU 10202",
          "note": "The maker states this for the firearm as a whole, not for a named part.",
          "source": {
            "title": "Smith & Wesson M&P15 Sport II — product specifications, SKU 10202",
            "publisher": "Smith & Wesson Brands, Inc.",
            "reliability": "primary",
            "url": "https://www.smith-wesson.com/product/m-p-15-sport-ii",
            "page": null,
            "pdfPage": null,
            "pageUrl": null,
            "quote": "COLOR/FINISH … BLACK"
          }
        },
        {
          "component": "Grips",
          "material": "POLYMER",
          "finish": null,
          "appliesTo": "M&P15 Sport II, 16in, SKU 10202",
          "note": null,
          "source": {
            "title": "Smith & Wesson M&P15 Sport II — product specifications, SKU 10202",
            "publisher": "Smith & Wesson Brands, Inc.",
            "reliability": "primary",
            "url": "https://www.smith-wesson.com/product/m-p-15-sport-ii",
            "page": null,
            "pdfPage": null,
            "pageUrl": null,
            "quote": "GRIP … POLYMER"
          }
        }
      ],
      "note": "The components the procedures above separate. Coating, masking and cure are outside this database; follow your coating system's instructions. A part the manufacturer marks \"factory fit\" should not be swapped or reworked."
    },
    {
      "id": "reassemble",
      "title": "Reassemble",
      "videos": [],
      "procedures": [
        {
          "procedure": "reassembly",
          "title": "Reassembly",
          "configuration": false,
          "steps": [
            {
              "n": 1,
              "instruction": "Insert the bolt into the carrier with the extractor oriented toward the ejection port side."
            },
            {
              "n": 2,
              "instruction": "Push the bolt fully into the carrier, drop the cam pin into its hole, and rotate it 90 degrees.",
              "warning": "If the cam pin is not rotated, the firing pin will not seat. Never force the firing pin."
            },
            {
              "n": 3,
              "instruction": "Drop the firing pin into the rear of the carrier, tail first, and let it seat fully."
            },
            {
              "n": 4,
              "instruction": "Install the firing pin retaining pin. If it will not go in, the cam pin is missing or not rotated.",
              "warning": "This is the design’s built-in check. Do not defeat it."
            },
            {
              "n": 5,
              "instruction": "Insert the charging handle into its channel and push it partway forward."
            },
            {
              "n": 6,
              "instruction": "Insert the bolt carrier group into the charging handle’s track and slide both fully home."
            },
            {
              "n": 7,
              "instruction": "Mate the upper to the lower, press the front pivot pin home, close the receivers, and press the rear takedown pin home."
            },
            {
              "n": 8,
              "instruction": "Charge the rifle and perform the function check."
            }
          ],
          "instruction": null
        }
      ]
    },
    {
      "id": "torque",
      "title": "Torque",
      "coverage": "sourced",
      "manufacturer": [
        {
          "fastener": "One-piece free-floating forend/rail screws (3), 5/32˝ driver",
          "appliesTo": "S&W M&P Sport series and Volunteer series centerfire rifles with a one-piece aluminum free-floating forend (e.g. M&P15 Sport III), if so-equipped",
          "qualifier": "range",
          "value": 45,
          "valueMax": 50,
          "unit": "in-lb",
          "converted": {
            "value": {
              "N-m": 5.1,
              "in-lb": 45,
              "ft-lb": 3.7
            },
            "valueMax": {
              "N-m": 5.6,
              "in-lb": 50,
              "ft-lb": 4.2
            }
          },
          "sequence": "Check that these (3) forend screws are secure (FIGURE 68).",
          "threadlocker": null,
          "source": {
            "title": "Safety & Instruction Manual for Centerfire Semi-Automatic Rifles including Volunteer Series & Sport Series (p/n 3015611, REV S&W_M&P_CF_MSR_REV_022724, © 2024), linked from smith-wesson.com/products/mp-15-sport-iii",
            "publisher": "Smith & Wesson",
            "reliability": "primary",
            "url": "https://smith-wesson.canto.com/direct/document/s9hki7flkd0ar8802osm6p5j75/l-npJQUqV1KM75UlvNhw1q3siAA/original?content-type=application%2Fpdf",
            "page": "33",
            "pdfPage": 33,
            "pageUrl": "https://smith-wesson.canto.com/direct/document/s9hki7flkd0ar8802osm6p5j75/l-npJQUqV1KM75UlvNhw1q3siAA/original?content-type=application%2Fpdf#page=33",
            "quote": "The forend/rail screws use a 5/32˝ driver and should be torqued to 45-50 inch-pounds."
          }
        },
        {
          "fastener": "Forend/rail screws (3), 5/32˝ driver",
          "appliesTo": "S&W California Compliant Model centerfire semi-automatic rifle (M&P15 Sport III CA compliant)",
          "qualifier": "range",
          "value": 45,
          "valueMax": 50,
          "unit": "in-lb",
          "converted": {
            "value": {
              "N-m": 5.1,
              "in-lb": 45,
              "ft-lb": 3.7
            },
            "valueMax": {
              "N-m": 5.6,
              "in-lb": 50,
              "ft-lb": 4.2
            }
          },
          "sequence": "Check that these (3) forend screws are secure (FIGURE 118).",
          "threadlocker": null,
          "source": {
            "title": "Safety & Instruction Manual for California Compliant Model Centerfire Semi-Automatic Rifle (© 2026), linked from smith-wesson.com/products/mp-15-sport-iii",
            "publisher": "Smith & Wesson",
            "reliability": "primary",
            "url": "https://smith-wesson.canto.com/direct/document/3mde9sn0ct7ahcmuhjjkl7dt47/uQBnHdgJknuPT3BBklTqKtQQ6yM/original?content-type=application%2Fpdf",
            "page": "48",
            "pdfPage": 48,
            "pageUrl": "https://smith-wesson.canto.com/direct/document/3mde9sn0ct7ahcmuhjjkl7dt47/uQBnHdgJknuPT3BBklTqKtQQ6yM/original?content-type=application%2Fpdf#page=48",
            "quote": "The forend/rail screws use a 5/32˝ driver and should be torqued to 45-50 inch-pounds."
          }
        },
        {
          "fastener": "M-LOK accessory screws: polymer accessories to metal handguards",
          "appliesTo": "S&W M&P15 / M&P Sport and Volunteer series rifles with M-LOK handguards (M-LOK accessory rails and accessories)",
          "qualifier": "exact",
          "value": 15,
          "valueMax": null,
          "unit": "in-lb",
          "converted": {
            "value": {
              "N-m": 1.7,
              "in-lb": 15,
              "ft-lb": 1.2
            },
            "valueMax": null
          },
          "sequence": "Thread the T-nuts onto the (nylon-patched) screws, insert and 'bias' the accessory toward the front of the slot, then 'tighten all fasteners to the recommended torque spec'; confirm the T-nut rotates 90° into the locked position. Source: 'The installation torque values are not minimums, they are recommended limits. The nylon patch compound (thread lock) may slightly affect the torque reading if using an in/lb torque wrench.'",
          "threadlocker": "Screws have a nylon patch; if worn, restore with Rocksett or Loctite blue thread-locker stick",
          "source": {
            "title": "Safety & Instruction Manual for Centerfire Semi-Automatic Rifles including Volunteer Series & Sport Series (p/n 3015611, REV S&W_M&P_CF_MSR_REV_022724, © 2024), linked from smith-wesson.com/products/mp-15-sport-iii",
            "publisher": "Smith & Wesson",
            "reliability": "primary",
            "url": "https://smith-wesson.canto.com/direct/document/s9hki7flkd0ar8802osm6p5j75/l-npJQUqV1KM75UlvNhw1q3siAA/original?content-type=application%2Fpdf",
            "page": "57",
            "pdfPage": 57,
            "pageUrl": "https://smith-wesson.canto.com/direct/document/s9hki7flkd0ar8802osm6p5j75/l-npJQUqV1KM75UlvNhw1q3siAA/original?content-type=application%2Fpdf#page=57",
            "quote": "For attaching polymer accessories to metal handguards: 15 in/lbs."
          }
        },
        {
          "fastener": "M-LOK accessory screws: polymer or metal accessories to polymer handguards",
          "appliesTo": "S&W M&P15 / M&P Sport and Volunteer series rifles with M-LOK handguards (M-LOK accessory rails and accessories)",
          "qualifier": "exact",
          "value": 15,
          "valueMax": null,
          "unit": "in-lb",
          "converted": {
            "value": {
              "N-m": 1.7,
              "in-lb": 15,
              "ft-lb": 1.2
            },
            "valueMax": null
          },
          "sequence": "Thread the T-nuts onto the (nylon-patched) screws, insert and 'bias' the accessory toward the front of the slot, then 'tighten all fasteners to the recommended torque spec'; confirm the T-nut rotates 90° into the locked position. Source: 'The installation torque values are not minimums, they are recommended limits. The nylon patch compound (thread lock) may slightly affect the torque reading if using an in/lb torque wrench.'",
          "threadlocker": "Screws have a nylon patch; if worn, restore with Rocksett or Loctite blue thread-locker stick",
          "source": {
            "title": "Safety & Instruction Manual for Centerfire Semi-Automatic Rifles including Volunteer Series & Sport Series (p/n 3015611, REV S&W_M&P_CF_MSR_REV_022724, © 2024), linked from smith-wesson.com/products/mp-15-sport-iii",
            "publisher": "Smith & Wesson",
            "reliability": "primary",
            "url": "https://smith-wesson.canto.com/direct/document/s9hki7flkd0ar8802osm6p5j75/l-npJQUqV1KM75UlvNhw1q3siAA/original?content-type=application%2Fpdf",
            "page": "57",
            "pdfPage": 57,
            "pageUrl": "https://smith-wesson.canto.com/direct/document/s9hki7flkd0ar8802osm6p5j75/l-npJQUqV1KM75UlvNhw1q3siAA/original?content-type=application%2Fpdf#page=57",
            "quote": "For attaching polymer or metal accessories to polymer handguards: 15 in/lbs."
          }
        },
        {
          "fastener": "M-LOK accessory screws: metal accessories to metal handguards",
          "appliesTo": "S&W M&P15 / M&P Sport and Volunteer series rifles with M-LOK handguards (M-LOK accessory rails and accessories)",
          "qualifier": "exact",
          "value": 35,
          "valueMax": null,
          "unit": "in-lb",
          "converted": {
            "value": {
              "N-m": 4,
              "in-lb": 35,
              "ft-lb": 2.9
            },
            "valueMax": null
          },
          "sequence": "Thread the T-nuts onto the (nylon-patched) screws, insert and 'bias' the accessory toward the front of the slot, then 'tighten all fasteners to the recommended torque spec'; confirm the T-nut rotates 90° into the locked position. Source: 'The installation torque values are not minimums, they are recommended limits. The nylon patch compound (thread lock) may slightly affect the torque reading if using an in/lb torque wrench.'",
          "threadlocker": "Screws have a nylon patch; if worn, restore with Rocksett or Loctite blue thread-locker stick",
          "source": {
            "title": "Safety & Instruction Manual for Centerfire Semi-Automatic Rifles including Volunteer Series & Sport Series (p/n 3015611, REV S&W_M&P_CF_MSR_REV_022724, © 2024), linked from smith-wesson.com/products/mp-15-sport-iii",
            "publisher": "Smith & Wesson",
            "reliability": "primary",
            "url": "https://smith-wesson.canto.com/direct/document/s9hki7flkd0ar8802osm6p5j75/l-npJQUqV1KM75UlvNhw1q3siAA/original?content-type=application%2Fpdf",
            "page": "57",
            "pdfPage": 57,
            "pageUrl": "https://smith-wesson.canto.com/direct/document/s9hki7flkd0ar8802osm6p5j75/l-npJQUqV1KM75UlvNhw1q3siAA/original?content-type=application%2Fpdf#page=57",
            "quote": "For attaching metal accessories to metal handguards: 35 in/lbs."
          }
        }
      ],
      "reported": [],
      "notes": "S&W says of the M-LOK values that they \"are not minimums, they are recommended limits\" — treat them as the most to apply, not a target to reach. The forend/rail screw value applies only to rifles fitted with S&W's one-piece free-floating forend."
    },
    {
      "id": "function-check",
      "title": "Function check",
      "checks": [
        "Verify the rifle is unloaded with no magazine inserted before each step.",
        "Charge the rifle to cock the hammer, place the selector on SAFE, and press the trigger. The hammer must not fall.",
        "Move the selector to SEMI and press the trigger. The hammer should fall.",
        "Hold the trigger to the rear, charge the rifle, then release the trigger slowly and listen for the disconnector to release the hammer to the trigger.",
        "Press the trigger again. The hammer should fall.",
        "Insert an empty magazine, charge the rifle, and confirm the bolt locks back."
      ],
      "videos": []
    }
  ],
  "troubleshooting": [],
  "sources": [
    {
      "n": 1,
      "id": null,
      "title": "TM 9-1005-319-10: Rifle, 5.56mm, M16A2/M4 Carbine",
      "publisher": "U.S. Department of the Army",
      "reliability": "primary",
      "url": null,
      "accessed": null
    },
    {
      "n": 2,
      "id": null,
      "title": "Smith & Wesson M&P15 Owner’s Manual",
      "publisher": "Smith & Wesson",
      "reliability": "primary",
      "url": null,
      "accessed": null
    },
    {
      "n": 3,
      "id": "smith-wesson-df8ea4",
      "title": "Safety & Instruction Manual for Centerfire Semi-Automatic Rifles including Volunteer Series & Sport Series (p/n 3015611, REV S&W_M&P_CF_MSR_REV_022724, © 2024), linked from smith-wesson.com/products/mp-15-sport-iii",
      "publisher": "Smith & Wesson",
      "reliability": "primary",
      "url": "https://smith-wesson.canto.com/direct/document/s9hki7flkd0ar8802osm6p5j75/l-npJQUqV1KM75UlvNhw1q3siAA/original?content-type=application%2Fpdf",
      "accessed": "2026-09-27"
    },
    {
      "n": 4,
      "id": "smith-wesson-480995",
      "title": "Safety & Instruction Manual for California Compliant Model Centerfire Semi-Automatic Rifle (© 2026), linked from smith-wesson.com/products/mp-15-sport-iii",
      "publisher": "Smith & Wesson",
      "reliability": "primary",
      "url": "https://smith-wesson.canto.com/direct/document/3mde9sn0ct7ahcmuhjjkl7dt47/uQBnHdgJknuPT3BBklTqKtQQ6yM/original?content-type=application%2Fpdf",
      "accessed": "2026-09-27"
    },
    {
      "n": 5,
      "id": "smith-wesson-specs-98b18e",
      "title": "Smith & Wesson M&P15 Sport II — product specifications, SKU 10202",
      "publisher": "Smith & Wesson Brands, Inc.",
      "reliability": "primary",
      "url": "https://www.smith-wesson.com/product/m-p-15-sport-ii",
      "accessed": "2026-10-03"
    },
    {
      "n": 6,
      "id": "pat-smith-wesson-704590",
      "title": "Virtual Patent Marking | Smith & Wesson",
      "publisher": "Smith & Wesson",
      "reliability": "primary",
      "url": "https://www.smith-wesson.com/company/virtual-patent-marking",
      "accessed": "2026-10-13"
    },
    {
      "n": 7,
      "id": "tier-73313a6b",
      "title": "DIY AR-15 Build: Pivot Pin Installation",
      "publisher": "ITS Tactical",
      "reliability": "secondary",
      "url": "https://www.itstactical.com/?p=10638",
      "accessed": "2026-10-29"
    },
    {
      "n": 8,
      "id": "tier-0310b242",
      "title": "(Gunsmithing the AR-15 #2) The 30-Second AR Check",
      "publisher": "Gun Tests",
      "reliability": "secondary",
      "url": "https://www.gun-tests.com/?p=26007",
      "accessed": "2026-10-29"
    },
    {
      "n": 9,
      "id": "tier-41721d1b",
      "title": "The Gun Digest Book of Exploded Gun Drawings (975 isometric views) — Colt 'AR15-A2 Sporter Autoloading Rifle'",
      "publisher": "Gun Digest Books / Krause Publications (scan on archive.org)",
      "reliability": "secondary",
      "url": "https://archive.org/download/the-book-of-exploded-gun-drawings-975-isometric-views/The%20Book%20of%20Exploded%20Gun%20Drawings%20-%20975%20Isometric%20Views.pdf",
      "accessed": "2026-10-29"
    }
  ]
}