{
  "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": "mossberg-930",
    "name": "Mossberg 930",
    "manufacturer": {
      "id": "mossberg",
      "name": "O.F. Mossberg & Sons"
    },
    "category": "shotgun",
    "action": "gas-operated-short-stroke",
    "calibers": [
      "12 gauge"
    ],
    "alsoKnownAs": [
      "930 SPX",
      "935 Magnum"
    ],
    "coversAlso": [
      "Mossberg 930 SPX",
      "Mossberg 935 Magnum"
    ],
    "page": "firearms/mossberg-930.html",
    "bundle": "api/v1/firearms/mossberg-930.json",
    "lastUpdated": "2026-10-29"
  },
  "notices": [
    "O.F. Mossberg & Sons limits owner disassembly: Field strip only: barrel, gas system parts, trigger housing (removed whole), operating handle, bolt and slide assemblies and link.",
    "This work order is written for the Mossberg 930. It is reported to cover Mossberg 930 SPX; Mossberg 935 Magnum — if the firearm on the bench is one of those, check the torque notes: values do not always carry over.",
    "No torque values are recorded for this firearm. Get them from the manufacturer or a gunsmith; do not estimate."
  ],
  "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": "medium",
    "verification": "community-reviewed"
  },
  "manufacturerDisassembly": {
    "status": "limited",
    "limit": "Field strip only: barrel, gas system parts, trigger housing (removed whole), operating handle, bolt and slide assemblies and link.",
    "statement": "Mossberg says field disassembly is complete at that point and the 930 should not be disassembled further; further disassembly, including the trigger housing, is for an authorized Product Service Center or a qualified gunsmith.",
    "source": {
      "title": "930 / 935 Owner's Manual (doc 16888)",
      "publisher": "O.F. Mossberg & Sons, Inc.",
      "reliability": "primary",
      "url": "https://resources.mossberg.com/hubfs/manuals/16888-930-935-Owners-Manual.pdf",
      "page": "16",
      "pdfPage": 16,
      "pageUrl": "https://resources.mossberg.com/hubfs/manuals/16888-930-935-Owners-Manual.pdf#page=16",
      "quote": "Field disassembly is now complete. The firearm should not be disassembled any further for routine cleaning or maintenance. Further disassembly should only be performed at an authorized Product Service Center or by a qualified gunsmith."
    }
  },
  "recalls": [],
  "shopTier": {
    "tier": 2,
    "group": "shotgun",
    "rating": "Pew-Takedown editorial rating (1 easy – 3 hardest), not the manufacturer's",
    "reason": "Only 43 listed items (45 pieces), but the gas system is a six-part stack on the magazine tube with an orientation-sensitive seal ring and split gas rings that are peeled off with a screwdriver, the trigger housing is a complex assembly Mossberg reserves for a gunsmith, and the magazine spring is heavily loaded. Low Tier 2.",
    "confidence": "medium",
    "partCount": {
      "value": 43,
      "kind": "line-items",
      "covers": "Mossberg 930/935 parts list, complete gun; 43 rows, trigger housing listed as one assembly",
      "basis": "manufacturer-parts-list",
      "source": {
        "title": "930 / 935 Owner's Manual (doc 16888)",
        "publisher": "O.F. Mossberg & Sons, Inc.",
        "reliability": "primary",
        "url": "https://resources.mossberg.com/hubfs/manuals/16888-930-935-Owners-Manual.pdf",
        "page": "31–32",
        "pdfPage": 31,
        "pageUrl": "https://resources.mossberg.com/hubfs/manuals/16888-930-935-Owners-Manual.pdf#page=31",
        "quote": "43 RECOIL PAD SCREW (2)"
      }
    },
    "painPoints": [
      {
        "issue": "The gas system comes off the magazine tube as a stack (seal ring, piston assembly, spacer tube, pusher, return spring, forearm retainer) that must go back in order, with the seal ring's angled face outward.",
        "during": "reassembly",
        "source": {
          "title": "930 / 935 Owner's Manual (doc 16888)",
          "publisher": "O.F. Mossberg & Sons, Inc.",
          "reliability": "primary",
          "url": "https://resources.mossberg.com/hubfs/manuals/16888-930-935-Owners-Manual.pdf",
          "page": null,
          "pdfPage": null,
          "pageUrl": null,
          "quote": "Note the orientation of the seal ring* for reassembly. The angled surface of the seal ring* must face outward."
        }
      },
      {
        "issue": "The split outer and inner gas rings are pried and peeled off the piston with a screwdriver held while the piston is rotated, and must be refitted the same way.",
        "during": "both",
        "source": {
          "title": "930 / 935 Owner's Manual (doc 16888)",
          "publisher": "O.F. Mossberg & Sons, Inc.",
          "reliability": "primary",
          "url": "https://resources.mossberg.com/hubfs/manuals/16888-930-935-Owners-Manual.pdf",
          "page": null,
          "pdfPage": null,
          "pageUrl": null,
          "quote": "Use the screwdriver to pry the outer gas ring away from the gas piston no more than 1/4” and hold it in this position."
        }
      },
      {
        "issue": "The trigger housing is a complex assembly Mossberg says must not be taken apart outside a service centre or by a gunsmith, and the hammer must not be dropped with it out.",
        "during": "both",
        "source": {
          "title": "930 / 935 Owner's Manual (doc 16888)",
          "publisher": "O.F. Mossberg & Sons, Inc.",
          "reliability": "primary",
          "url": "https://resources.mossberg.com/hubfs/manuals/16888-930-935-Owners-Manual.pdf",
          "page": null,
          "pdfPage": null,
          "pageUrl": null,
          "quote": "The trigger housing assembly is a complex assembly and must not be disassembled."
        }
      },
      {
        "issue": "The magazine spring is under considerable pressure and extends to full length when the end cap comes off.",
        "during": "both",
        "source": {
          "title": "930 / 935 Owner's Manual (doc 16888)",
          "publisher": "O.F. Mossberg & Sons, Inc.",
          "reliability": "primary",
          "url": "https://resources.mossberg.com/hubfs/manuals/16888-930-935-Owners-Manual.pdf",
          "page": null,
          "pdfPage": null,
          "pageUrl": null,
          "quote": "The magazine spring is under considerable pressure and is retained by the magazine end cap."
        }
      }
    ],
    "minutes": {
      "strip": 45,
      "rebuild": 65,
      "basis": "estimated",
      "note": "Strip of gas stack, piston rings, bolt/slide/link, trigger housing (kept whole unless coated) and stock; rebuild longer for the gas stack order and the heavy magazine spring.",
      "source": null
    },
    "stripScope": [
      {
        "assembly": "Barrel / gas",
        "removes": [
          "magazine end cap",
          "barrel",
          "seal ring (angled face out), gas piston assembly and rings, spacer tube, pusher, return spring, forearm retainer",
          "magazine spring and follower"
        ]
      },
      {
        "assembly": "Receiver",
        "removes": [
          "two trigger housing pins and trigger housing",
          "operating handle",
          "bolt and slide",
          "link pin and link"
        ]
      },
      {
        "assembly": "Trigger housing",
        "removes": [
          "hammer, sear, disconnector and springs (Mossberg: service centre only)"
        ]
      },
      {
        "assembly": "Stock",
        "removes": [
          "recoil pad screws",
          "stock bolt"
        ]
      }
    ],
    "hardware": {
      "pins": 6,
      "springs": 7,
      "detents": 2,
      "basis": "counted from the manufacturer's parts list (one per key number unless a quantity is given)"
    },
    "specialTools": [
      {
        "tool": "Thin flat screwdriver",
        "usedFor": "Peeling the split gas rings off the piston"
      },
      {
        "tool": "Punch no larger than 1/8 in.",
        "usedFor": "Trigger housing pins and link pin"
      }
    ],
    "fitOnRebuild": [
      {
        "check": "Seal ring orientation",
        "why": "The angled face must face outward or the gas system leaks and the gun short-cycles.",
        "source": {
          "title": "930 / 935 Owner's Manual (doc 16888)",
          "publisher": "O.F. Mossberg & Sons, Inc.",
          "reliability": "primary",
          "url": "https://resources.mossberg.com/hubfs/manuals/16888-930-935-Owners-Manual.pdf",
          "page": null,
          "pdfPage": null,
          "pageUrl": null,
          "quote": "The angled surface of the seal ring* must face outward."
        }
      },
      {
        "check": "Function check: safety, trigger/sear release, disconnector and feeding with dummy rounds",
        "why": "Standard after any detail strip; a mis-assembled sear or disconnector can double or fail to fire.",
        "source": null
      }
    ],
    "assessed": "2026-10-29"
  },
  "videos": [],
  "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": "Push the tang safety rearward to the safe position."
        },
        {
          "n": 3,
          "instruction": "Pull the bolt handle rearward to eject any chambered shell and lock the bolt open.",
          "partsFreed": [
            "Chambered shell, if present"
          ]
        },
        {
          "n": 4,
          "instruction": "Cycle the action repeatedly, catching each shell as it ejects, until no more shells feed from the magazine tube."
        },
        {
          "n": 5,
          "instruction": "With the action open, inspect the chamber and look up the magazine tube with a light.",
          "warning": "The chamber AND the tube. A shell hung up in the tube is easy to miss."
        },
        {
          "n": 6,
          "instruction": "Physically confirm the chamber is empty and remove all live ammunition from the work area."
        }
      ],
      "videos": []
    },
    {
      "id": "disassemble",
      "title": "Disassemble",
      "videos": [],
      "procedures": [
        {
          "procedure": "field-strip",
          "title": "Field Strip",
          "level": "field-strip",
          "configuration": false,
          "steps": [
            {
              "n": 1,
              "instruction": "Complete the Clear and Make Safe procedure."
            },
            {
              "n": 2,
              "instruction": "Unscrew the magazine cap from the end of the magazine tube and remove the forend.",
              "partsFreed": [
                "Magazine cap",
                "Forend"
              ]
            },
            {
              "n": 3,
              "instruction": "Pull the barrel forward off the magazine tube and out of the receiver.",
              "partsFreed": [
                "Barrel"
              ]
            },
            {
              "n": 4,
              "instruction": "Slide the gas piston, seals, and spacer off the magazine tube, noting the order and orientation of each.",
              "warning": "Note the order and which way each part faces. Reassembled wrong, the gun will not cycle.",
              "partsFreed": [
                "Gas piston",
                "Seals",
                "Spacer"
              ]
            },
            {
              "n": 5,
              "instruction": "Pull the bolt handle out of the bolt.",
              "partsFreed": [
                "Bolt handle"
              ]
            },
            {
              "n": 6,
              "instruction": "Slide the bolt assembly forward and out of the receiver.",
              "partsFreed": [
                "Bolt assembly"
              ]
            },
            {
              "n": 7,
              "instruction": "Push out the trigger group pin and lift the trigger group out of the receiver.",
              "partsFreed": [
                "Trigger group"
              ]
            }
          ]
        }
      ]
    },
    {
      "id": "refinish",
      "title": "Refinish",
      "components": [
        {
          "name": "Magazine cap",
          "procedure": "field-strip",
          "level": "field-strip",
          "step": 2
        },
        {
          "name": "Forend",
          "procedure": "field-strip",
          "level": "field-strip",
          "step": 2
        },
        {
          "name": "Barrel",
          "procedure": "field-strip",
          "level": "field-strip",
          "step": 3
        },
        {
          "name": "Gas piston",
          "procedure": "field-strip",
          "level": "field-strip",
          "step": 4
        },
        {
          "name": "Seals",
          "procedure": "field-strip",
          "level": "field-strip",
          "step": 4
        },
        {
          "name": "Spacer",
          "procedure": "field-strip",
          "level": "field-strip",
          "step": 4
        },
        {
          "name": "Bolt handle",
          "procedure": "field-strip",
          "level": "field-strip",
          "step": 5
        },
        {
          "name": "Bolt assembly",
          "procedure": "field-strip",
          "level": "field-strip",
          "step": 6
        },
        {
          "name": "Trigger group",
          "procedure": "field-strip",
          "level": "field-strip",
          "step": 7
        }
      ],
      "manufacturerPartsList": {
        "parts": 43,
        "scope": "\"MOSSBERG MODEL 930™ and 935™ PARTS LIST\", shared by the 930 and 935 Magnum. Exploded view on p. 32. Names only, no part numbers. No variant lists."
      },
      "partsDiagrams": [],
      "materials": [],
      "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": "Install the trigger group into the receiver and insert its pin fully."
            },
            {
              "n": 2,
              "instruction": "Slide the bolt assembly into the receiver, engaging the link with the recoil spring plunger."
            },
            {
              "n": 3,
              "instruction": "Install the bolt handle into the bolt."
            },
            {
              "n": 4,
              "instruction": "Slide the gas piston, seals, and spacer back onto the magazine tube in the correct order and orientation.",
              "warning": "Check against a parts diagram if you are unsure."
            },
            {
              "n": 5,
              "instruction": "Set the barrel into the receiver with its extension seated fully and its ring over the magazine tube."
            },
            {
              "n": 6,
              "instruction": "Install the forend and thread the magazine cap on, hand-tightening firmly.",
              "warning": "A loose magazine cap causes malfunctions and lets the barrel move. Check it before every use."
            },
            {
              "n": 7,
              "instruction": "Cycle the action several times and perform the function check."
            }
          ],
          "instruction": null
        }
      ]
    },
    {
      "id": "torque",
      "title": "Torque",
      "coverage": "none-recorded",
      "manufacturer": [],
      "reported": [],
      "notes": "The manufacturer's documents give no torque value. They say: \"Install the stock nut spacer and the stock nut. Do not over-tighten the stock nut.\" (930 / 935 Owner's Manual (doc 16888), PDF p. 26) \"Replace the recoil pad. Do not over-tighten the screws.\" (930 / 935 Owner's Manual (doc 16888), PDF p. 26)"
    },
    {
      "id": "function-check",
      "title": "Function check",
      "checks": [
        "Verify the shotgun is unloaded — chamber and magazine tube — before each step.",
        "Cycle the action by hand and confirm the bolt locks fully into battery.",
        "With the hammer cocked, engage the safety and press the trigger. The hammer must not fall.",
        "Disengage the safety and press the trigger. The hammer should fall.",
        "Confirm the bolt locks open when retracted and releases with the carrier release.",
        "Load two dummy shells into the magazine and confirm they feed and eject one at a time.",
        "Confirm the magazine cap is tight."
      ],
      "videos": []
    }
  ],
  "troubleshooting": [],
  "sources": [
    {
      "n": 1,
      "id": null,
      "title": "Mossberg 930 Autoloading Shotgun Owner’s Manual",
      "publisher": "O.F. Mossberg & Sons, Inc.",
      "reliability": "primary",
      "url": null,
      "accessed": null
    },
    {
      "n": 2,
      "id": "o-f-mossberg-sons-inc-704b37",
      "title": "930 / 935 Owner's Manual (doc 16888)",
      "publisher": "O.F. Mossberg & Sons, Inc.",
      "reliability": "primary",
      "url": "https://resources.mossberg.com/hubfs/manuals/16888-930-935-Owners-Manual.pdf",
      "accessed": "2026-09-27"
    }
  ]
}