{
  "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-590-shockwave",
    "name": "Mossberg 590 Shockwave",
    "manufacturer": {
      "id": "mossberg",
      "name": "O.F. Mossberg & Sons"
    },
    "category": "shotgun",
    "action": "pump-action",
    "calibers": [
      "12 gauge",
      "20 gauge",
      ".410 bore"
    ],
    "alsoKnownAs": [
      "Shockwave",
      "590 Shockwave 12ga"
    ],
    "coversAlso": [
      "Mossberg 590 Shockwave in 12 gauge, 20 gauge, and .410",
      "Remington TAC-14 (similar configuration on an 870 action)"
    ],
    "page": "firearms/mossberg-590-shockwave.html",
    "bundle": "api/v1/firearms/mossberg-590-shockwave.json",
    "lastUpdated": "2026-10-29"
  },
  "notices": [
    "O.F. Mossberg & Sons limits owner disassembly: Field strip only: barrel, trigger housing assembly (removed whole, not disassembled), bolt slide, bolt assembly, elevator and forearm/action slide assembly.",
    "This work order is written for the Mossberg 590 Shockwave. It is reported to cover Mossberg 590 Shockwave in 12 gauge, 20 gauge, and .410; Remington TAC-14 (similar configuration on an 870 action) — 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, trigger housing assembly (removed whole, not disassembled), bolt slide, bolt assembly, elevator and forearm/action slide assembly.",
    "statement": "Mossberg says field disassembly is complete at that point and the firearm should not be disassembled further; further disassembly, including of the trigger housing, is for an authorized Product Service Center or a qualified gunsmith.",
    "source": {
      "title": "Owners Manual for 500 and 590 Shockwave and Compact Cruiser (doc 103855)",
      "publisher": "O.F. Mossberg & Sons, Inc.",
      "reliability": "primary",
      "url": "https://resources.mossberg.com/hubfs/manuals/103855-Pump-Action-Firearms-002.pdf",
      "page": "14",
      "pdfPage": 14,
      "pageUrl": "https://resources.mossberg.com/hubfs/manuals/103855-Pump-Action-Firearms-002.pdf#page=14",
      "quote": "CAUTION: Field disassembly is now complete! The firearm should not be disassembled further for routine cleaning or maintenance. Further disassembly should only be performed by an Authorized Product Service Center or by a qualified gunsmith."
    }
  },
  "recalls": [],
  "shopTier": {
    "tier": 1,
    "group": "shotgun",
    "rating": "Pew-Takedown editorial rating (1 easy – 3 hardest), not the manufacturer's",
    "reason": "The shortest list in the category (34 items) on the 500/590 action; nothing held under tension while a pin goes in. Same alignment traps as the 500 (bolt slide and action bars, shell stop and interrupter) and the 590 magazine spring retainer.",
    "confidence": "high",
    "partCount": {
      "value": 34,
      "kind": "line-items",
      "covers": "Shockwave exploded-view parts list shared by the 500 and 590 Shockwave (rows 1 and 4 are 500-only, 7 and 8 are 590-only); trigger housing and bolt listed as assemblies",
      "basis": "manufacturer-parts-list",
      "source": {
        "title": "Owners Manual for 500 and 590 Shockwave and Compact Cruiser (doc 103855)",
        "publisher": "O.F. Mossberg & Sons, Inc.",
        "reliability": "primary",
        "url": "https://resources.mossberg.com/hubfs/manuals/103855-Pump-Action-Firearms-002.pdf",
        "page": "30–31",
        "pdfPage": 30,
        "pageUrl": "https://resources.mossberg.com/hubfs/manuals/103855-Pump-Action-Firearms-002.pdf#page=30",
        "quote": "35 PISTOL GRIP PLUG"
      }
    },
    "painPoints": [
      {
        "issue": "The bolt, bolt slide and both action slide bars have to go back in the same relationship they came out; a bar out of its cut or a bolt slide offered at the wrong point of forend travel will not drop in or binds the action.",
        "during": "reassembly",
        "source": {
          "title": "Owners Manual for 500 and 590 Shockwave and Compact Cruiser (doc 103855)",
          "publisher": "O.F. Mossberg & Sons, Inc.",
          "reliability": "primary",
          "url": "https://resources.mossberg.com/hubfs/manuals/103855-Pump-Action-Firearms-002.pdf",
          "page": null,
          "pdfPage": null,
          "pageUrl": null,
          "quote": "Pay special attention to the position of the bolt, bolt slide and action slide bar assembly during this portion of the disassembly, as the parts must be in the same relationship during reassembly."
        }
      },
      {
        "issue": "On 590-pattern guns the magazine spring retainer and spring are under significant pressure when the cap comes off or goes back on.",
        "during": "both",
        "source": {
          "title": "Owners Manual for 500 and 590 Shockwave and Compact Cruiser (doc 103855)",
          "publisher": "O.F. Mossberg & Sons, Inc.",
          "reliability": "primary",
          "url": "https://resources.mossberg.com/hubfs/manuals/103855-Pump-Action-Firearms-002.pdf",
          "page": null,
          "pdfPage": null,
          "pageUrl": null,
          "quote": "Model magazine spring retainers and springs are under significant spring pressure. Use caution to prevent injury"
        }
      },
      {
        "issue": "Owners report the shell stop and interrupter get jammed in wrong and the action bars mis-seated when the gun is forced together; it only runs once everything lines up.",
        "during": "reassembly",
        "source": {
          "title": "Seeking help from someone who owns a Mossberg 500 in the Bay Area",
          "publisher": "Calguns.net",
          "reliability": "anecdotal",
          "url": "https://www.calguns.net/forum/general-discussion/general-gun-discussions/910351-seeking-help-someone-own-mossberg-500-in-bay-area?p=21089362",
          "page": null,
          "pdfPage": null,
          "pageUrl": null,
          "quote": "mossbergs are great but they can be harder to put back together. it sounds like the action bars are not in the right spot. also i will bet the shell stop and interrupter are jammed in wrong."
        }
      },
      {
        "issue": "The hammer must be at full cock to get the trigger housing back in, and the safety must be on to reinstall the bolt; neither is obvious and forcing it damages parts.",
        "during": "reassembly",
        "source": {
          "title": "The Mossberg Model 500: History & Disassembly",
          "publisher": "American Rifleman (NRA)",
          "reliability": "secondary",
          "url": "https://www.americanrifleman.org/content/the-mossberg-model-500-history-disassembly",
          "page": null,
          "pdfPage": null,
          "pageUrl": null,
          "quote": "Be aware that the hammer must be in the full-cock position for reinsertion of the trigger assembly and that the safety must be in the “on” position to re-install the bolt assembly."
        }
      }
    ],
    "minutes": {
      "strip": 30,
      "rebuild": 45,
      "basis": "estimated",
      "note": "As Model 500 (Shockwave list is short); rebuild longer for bolt-slide/action-bar alignment and the 590 magazine spring.",
      "source": null
    },
    "stripScope": [
      {
        "assembly": "Barrel and magazine",
        "removes": [
          "barrel (takedown screw or magazine cap)",
          "magazine spring retainer, spring and follower",
          "magazine tube from receiver (optional)"
        ],
        "tools": [
          "strap wrench",
          "padded vise"
        ]
      },
      {
        "assembly": "Forend / action slide",
        "removes": [
          "action slide tube nut",
          "forend",
          "anti-rattle spring"
        ],
        "tools": [
          "tube nut tool"
        ]
      },
      {
        "assembly": "Receiver",
        "removes": [
          "trigger housing pin and trigger housing",
          "elevator",
          "cartridge stop and interrupter",
          "bolt and bolt slide",
          "ejector and ejector screw",
          "safety button screw, safety button, detent plate, detent ball and spring"
        ]
      },
      {
        "assembly": "Bolt",
        "removes": [
          "bolt lock pin and bolt lock",
          "extractor pins, extractors and springs",
          "firing pin retaining pin, firing pin, washer and spring"
        ]
      },
      {
        "assembly": "Trigger housing",
        "removes": [
          "hammer, trigger, sear and disconnector group on their pins (only if the housing itself is being coated; Mossberg advises"
        ]
      },
      {
        "assembly": "Stock / grip",
        "removes": [
          "recoil pad screws and pad",
          "stock bolt, lock washer and washer"
        ],
        "tools": [
          "long 1/2 in. or 13 mm socket on extension"
        ]
      }
    ],
    "hardware": {
      "pins": 1,
      "springs": 1,
      "detents": 0,
      "basis": "counted from the manufacturer's parts list (one per key number unless a quantity is given)"
    },
    "specialTools": [
      {
        "tool": "Tube nut tool",
        "usedFor": "Forend action slide tube nut"
      },
      {
        "tool": "Strap wrench and padded vise",
        "usedFor": "Magazine tube off the receiver"
      },
      {
        "tool": "Long socket extension",
        "usedFor": "Stock bolt deep in the buttstock"
      },
      {
        "tool": "Roll/pin punches 1/16-1/8 in.",
        "usedFor": "Bolt extractor and firing pin pins"
      }
    ],
    "fitOnRebuild": [
      {
        "check": "Magazine tube torqued and aligned to the barrel lug",
        "why": "Tube carries the barrel; it is refitted hand-tight-plus with a strap wrench and must line up with the takedown screw or cap.",
        "source": {
          "title": "TM 9-1005-338-13&P",
          "publisher": "Department of the Army",
          "reliability": "primary",
          "url": "https://archive.org/download/16-manuali-duso-e-manutenzione-per-armi-specifiche-use-and-maintenance-manuals-f_20230430/ARMY%20TM%209-1005-338-13%26P%20Technical%20Manual%20for%20Mossberg%2012-Gauge%20Shotgun%20Model%20500%2C%20590%20-%20May%202005.pdf",
          "page": null,
          "pdfPage": null,
          "pageUrl": null,
          "quote": "Place strap style pipe wrench around magazine tube assembly (2) and turn to the left (counterclockwise),"
        }
      },
      {
        "check": "Safety detent feel",
        "why": "The tang safety's ball and spring under the detent plate set the click; a missing ball gives a loose safety.",
        "source": null
      },
      {
        "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": [
    {
      "title": "Loading and Unloading - Mossberg 500 / 590 Series Shotguns",
      "url": "https://www.youtube.com/watch?v=3_ufCUSZ27s",
      "platform": "youtube",
      "embedUrl": null,
      "shows": [
        "clear-and-make-safe",
        "operation"
      ],
      "appliesTo": "Mossberg 500 / 590 series pump-action shotguns. Mossberg markets the Shockwave as the '590 Shockwave', but the video does not name it.",
      "published": "2020-05-12",
      "note": null,
      "channel": {
        "id": "UCgin5wRNdwlOY-Ocs4_qK4A",
        "name": "MOSSBERG",
        "url": "https://www.youtube.com/@MossbergCorp",
        "owner": "O.F. Mossberg & Sons, Inc. (also covers its Maverick Arms brand)"
      },
      "accessed": "2026-10-15"
    },
    {
      "title": "How Mossberg 500/590 Pump-Action Shotguns Work",
      "url": "https://www.youtube.com/watch?v=9itbuBE2sq0",
      "platform": "youtube",
      "embedUrl": null,
      "shows": [
        "operation"
      ],
      "appliesTo": "Mossberg 500 and 590 pump-action shotguns (per description). The Shockwave is a 590-family pump, but the video does not name it.",
      "published": "2024-06-18",
      "note": null,
      "channel": {
        "id": "UCgin5wRNdwlOY-Ocs4_qK4A",
        "name": "MOSSBERG",
        "url": "https://www.youtube.com/@MossbergCorp",
        "owner": "O.F. Mossberg & Sons, Inc. (also covers its Maverick Arms brand)"
      },
      "accessed": "2026-10-15"
    }
  ],
  "configurations": [],
  "tools": [
    {
      "name": "Punch (roughly 1/8 in)",
      "required": false,
      "usedFor": "Pushing out the trigger housing pin if tight."
    }
  ],
  "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": "Press the action lock lever and pull the forend rearward to open the action, keeping your support hand behind the strap.",
          "partsFreed": [
            "Chambered shell, if present"
          ]
        },
        {
          "n": 4,
          "instruction": "Cycle the action repeatedly, catching each shell, until no more 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."
        },
        {
          "n": 6,
          "instruction": "Physically confirm the chamber is empty and remove all live ammunition from the work area."
        }
      ],
      "videos": [
        {
          "title": "Loading and Unloading - Mossberg 500 / 590 Series Shotguns",
          "url": "https://www.youtube.com/watch?v=3_ufCUSZ27s",
          "platform": "youtube",
          "embedUrl": null,
          "shows": [
            "clear-and-make-safe",
            "operation"
          ],
          "appliesTo": "Mossberg 500 / 590 series pump-action shotguns. Mossberg markets the Shockwave as the '590 Shockwave', but the video does not name it.",
          "published": "2020-05-12",
          "note": null,
          "channel": {
            "id": "UCgin5wRNdwlOY-Ocs4_qK4A",
            "name": "MOSSBERG",
            "url": "https://www.youtube.com/@MossbergCorp",
            "owner": "O.F. Mossberg & Sons, Inc. (also covers its Maverick Arms brand)"
          },
          "accessed": "2026-10-15"
        }
      ]
    },
    {
      "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": "Close the action and unscrew the magazine cap at the muzzle end of the magazine tube.",
              "partsFreed": [
                "Magazine cap"
              ]
            },
            {
              "n": 3,
              "instruction": "Pull the barrel straight forward and off the magazine tube.",
              "partsFreed": [
                "Barrel"
              ]
            },
            {
              "n": 4,
              "instruction": "Push out the trigger housing pin from the left side of the receiver.",
              "partsFreed": [
                "Trigger housing pin"
              ]
            },
            {
              "n": 5,
              "instruction": "Lift the trigger housing assembly down and out of the receiver.",
              "partsFreed": [
                "Trigger housing assembly"
              ]
            },
            {
              "n": 6,
              "instruction": "Slide the forend assembly forward and withdraw the bolt and bolt slide out the front of the receiver.",
              "warning": "Do not bend the cartridge stops.",
              "partsFreed": [
                "Forend and action slide assembly",
                "Bolt",
                "Bolt slide"
              ]
            }
          ]
        }
      ]
    },
    {
      "id": "refinish",
      "title": "Refinish",
      "components": [
        {
          "name": "Magazine cap",
          "procedure": "field-strip",
          "level": "field-strip",
          "step": 2
        },
        {
          "name": "Barrel",
          "procedure": "field-strip",
          "level": "field-strip",
          "step": 3
        },
        {
          "name": "Trigger housing pin",
          "procedure": "field-strip",
          "level": "field-strip",
          "step": 4
        },
        {
          "name": "Trigger housing assembly",
          "procedure": "field-strip",
          "level": "field-strip",
          "step": 5
        },
        {
          "name": "Forend and action slide assembly",
          "procedure": "field-strip",
          "level": "field-strip",
          "step": 6
        },
        {
          "name": "Bolt",
          "procedure": "field-strip",
          "level": "field-strip",
          "step": 6
        },
        {
          "name": "Bolt slide",
          "procedure": "field-strip",
          "level": "field-strip",
          "step": 6
        }
      ],
      "manufacturerPartsList": {
        "parts": 34,
        "scope": "\"EXPLODED VIEW PARTS LIST, SHOCKWAVE®\", shared by the 500 and 590 Shockwave. Rows 1 and 4 are 500-only; 7 and 8 are 590-only. The Compact Cruiser list (pp. 28–29) is left out. No part numbers."
      },
      "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": "Set the bolt slide into the bolt and feed the assembly into the receiver, both action bars in their grooves."
            },
            {
              "n": 2,
              "instruction": "Slide the forend rearward until the bolt is fully in the receiver.",
              "warning": "One bar out of its track will bind the action."
            },
            {
              "n": 3,
              "instruction": "Install the trigger housing and its pin."
            },
            {
              "n": 4,
              "instruction": "Seat the barrel fully into the receiver."
            },
            {
              "n": 5,
              "instruction": "Install and hand-tighten the magazine cap firmly.",
              "warning": "Check it before every use."
            },
            {
              "n": 6,
              "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: \"With a 1/4” allen head wrench attach the Raptor Grip to the receiver by tightening the socket head cap screw as seen in Figure 28.\" (Owners Manual for 500 and 590 Shockwave and Compact Cruiser (doc 103855), PDF p. 19) \"Slide the barrel into the receiver and tighten the magazine cap, finger tight only. DO NOT use pliers or a wrench to tighten magazine cap.\" (Owners Manual for 500 and 590 Shockwave and Compact Cruiser (doc 103855), PDF p. 7)"
    },
    {
      "id": "function-check",
      "title": "Function check",
      "checks": [
        "Verify the shotgun is unloaded — chamber and magazine tube — before each step.",
        "Cycle the action fully and confirm it locks closed.",
        "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.",
        "With the hammer down, confirm the action will not open until the action release is pressed.",
        "Load two dummy shells into the magazine and confirm they feed and eject one at a time.",
        "Confirm the forend strap is intact and secure — it is what keeps your hand behind the muzzle."
      ],
      "videos": []
    }
  ],
  "troubleshooting": [],
  "sources": [
    {
      "n": 1,
      "id": null,
      "title": "Mossberg 590 Shockwave Owner’s Manual",
      "publisher": "O.F. Mossberg & Sons, Inc.",
      "reliability": "primary",
      "url": null,
      "accessed": null
    },
    {
      "n": 2,
      "id": "o-f-mossberg-sons-inc-fc04a7",
      "title": "Owners Manual for 500 and 590 Shockwave and Compact Cruiser (doc 103855)",
      "publisher": "O.F. Mossberg & Sons, Inc.",
      "reliability": "primary",
      "url": "https://resources.mossberg.com/hubfs/manuals/103855-Pump-Action-Firearms-002.pdf",
      "accessed": "2026-09-27"
    },
    {
      "n": 3,
      "id": "tier-df7173c3",
      "title": "Seeking help from someone who owns a Mossberg 500 in the Bay Area",
      "publisher": "Calguns.net",
      "reliability": "anecdotal",
      "url": "https://www.calguns.net/forum/general-discussion/general-gun-discussions/910351-seeking-help-someone-own-mossberg-500-in-bay-area?p=21089362",
      "accessed": "2026-10-29"
    },
    {
      "n": 4,
      "id": "tier-d572986f",
      "title": "The Mossberg Model 500: History & Disassembly",
      "publisher": "American Rifleman (NRA)",
      "reliability": "secondary",
      "url": "https://www.americanrifleman.org/content/the-mossberg-model-500-history-disassembly",
      "accessed": "2026-10-29"
    },
    {
      "n": 5,
      "id": "tier-9e8a8a63",
      "title": "TM 9-1005-338-13&P",
      "publisher": "Department of the Army",
      "reliability": "primary",
      "url": "https://archive.org/download/16-manuali-duso-e-manutenzione-per-armi-specifiche-use-and-maintenance-manuals-f_20230430/ARMY%20TM%209-1005-338-13%26P%20Technical%20Manual%20for%20Mossberg%2012-Gauge%20Shotgun%20Model%20500%2C%20590%20-%20May%202005.pdf",
      "accessed": "2026-10-29"
    }
  ]
}