{ "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": "ar-10", "name": "AR-10 / .308 AR", "manufacturer": { "id": "generic-ar15", "name": "AR-15 Pattern (multiple manufacturers)" }, "category": "rifle", "action": "gas-operated-direct-impingement", "calibers": [ "7.62x51mm NATO", ".308 Winchester", "6.5 Creedmoor" ], "alsoKnownAs": [ "LR-308", "SR-25 pattern", "Large-frame AR" ], "coversAlso": [ "DPMS LR-308 pattern rifles", "Armalite AR-10 pattern rifles", "SR-25 pattern rifles" ], "page": "firearms/ar-10.html", "bundle": "api/v1/firearms/ar-10.json", "lastUpdated": "2026-10-29" }, "notices": [ "This work order is written for the AR-10 / .308 AR. It is reported to cover DPMS LR-308 pattern rifles; Armalite AR-10 pattern rifles; SR-25 pattern rifles — if the firearm on the bench is one of those, check the torque notes: values do not always carry over.", "No manufacturer torque values are recorded. The values listed are reported by other sources, not the manufacturer — confirm them before use." ], "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": "not-recorded", "limit": null, "statement": null, "source": null }, "recalls": [], "shopTier": { "tier": 2, "group": "rifle", "rating": "Pew-Takedown editorial rating (1 easy – 3 hardest), not the manufacturer's", "reason": "A large-frame AR with 63 key numbers (18 upper, 37 lower, 8 bolt carrier), so it strips like an AR-15 with heavier springs. It has the same detent and roll-pin traps, a highly compressed operating spring, and a barrel nut that needs the armorer's wrench, vise block and torque wrench. ArmaLite has headspace checked by a gunsmith if the barrel or bolt changes.", "confidence": "high", "partCount": { "value": 63, "kind": "line-items", "covers": "ArmaLite AR-10 (7.62 NATO): upper 1-18, lower 1-37, bolt carrier 1-8; bolt and charging handle as assemblies; variant rows marked * not counted", "basis": "manufacturer-parts-list", "source": { "title": "ArmaLite AR-10 / AR-10B Owner's Guide", "publisher": "ArmaLite, Inc.", "reliability": "primary", "url": "https://s3.amazonaws.com/files.ammunitiondepot.com/armalite-rifles/owners-manuals/armalite-ar10-ar10b-owners-guide.pdf", "page": "pp. 12-17 (6. Exploded Drawings and Part", "pdfPage": null, "pageUrl": null, "quote": "The below-listed parts are for AR-10®s in 7.62 NATO caliber." } }, "painPoints": [ { "issue": "The large-frame operating spring is under high compression and can get away during disassembly or reassembly.", "during": "both", "source": { "title": "ArmaLite AR-10 / AR-10B Owner's Guide", "publisher": "ArmaLite, Inc.", "reliability": "primary", "url": "https://s3.amazonaws.com/files.ammunitiondepot.com/armalite-rifles/owners-manuals/armalite-ar10-ar10b-owners-guide.pdf", "page": null, "pdfPage": null, "pageUrl": null, "quote": "OPERATING SPRING IS UNDER HIGH COMPRESSION. IF IT SLIPS FROM YOUR GRASP, IT COULD CAUSE INJURY." } }, { "issue": "The front pivot pin and rear takedown pin each sit on a spring-loaded detent that launches when the pin comes out; reinstalling the pivot pin means holding the detent down while the pin goes in, which is the classic AR lower trap.", "during": "both", "source": { "title": "AR Lower Receiver Build: Pivot Pin Installation", "publisher": "Shooting Illustrated (NRA)", "reliability": "secondary", "url": "https://www.shootingillustrated.com/content/ar-lower-receiver-build-pivot-pin-installation/", "page": null, "pdfPage": null, "pageUrl": null, "quote": "The detent and spring will fly out and you will be spending a lot of time on your knees looking for them." } }, { "issue": "The TM has the armorer use a pivot pin tool to compress the detent, and warns to catch the detent and spring as the pin comes out.", "during": "both", "source": { "title": "TM 9-1005-249-23&P, Rifle, 5.56mm, M16 and M16A1 (unit and direct support, incl. RPSTL)", "publisher": "Department of the Army", "reliability": "primary", "url": "https://archive.org/download/ArmyTechnicalManualforM16Rifle-Tm9-1005-249-23p/Manual-Tm9-1005-249-23p_djvu.txt", "page": null, "pdfPage": null, "pageUrl": null, "quote": "Catch detent and spring as pivot pin is" } }, { "issue": "The bolt catch and trigger guard roll pins mar the receiver unless the receiver is taped and supported and a roll-pin starter punch is used.", "during": "both", "source": { "title": "TFB Armorer's Bench: Complete AR15 Assembly - Lower Receiver", "publisher": "The Firearm Blog", "reliability": "secondary", "url": "https://www.thefirearmblog.com/blog/2022/07/31/tfb-armorers-bench-complete-ar15-assembly-lower-receiver/", "page": null, "pdfPage": null, "pageUrl": null, "quote": "Installing the bolt catch roll pin can be cumbersome and in the wrong hands, aesthetically destructive." } } ], "minutes": { "strip": 45, "rebuild": 65, "basis": "estimated", "note": "Estimate: as the AR-15, with heavier springs and a larger barrel nut; rebuild adds barrel-nut torque/indexing and the function check.", "source": null }, "stripScope": [ { "assembly": "Lower receiver", "removes": [ "pistol grip and screw (selector detent and spring)", "safety selector", "takedown pin, detent and spring", "pivot pin, detent and spring", "hammer, hammer spring and pin", "trigger, trigger spring, disconnector and spring, pin", "bolt catch, plunger, spring and roll pin", "magazine catch, spring and button", "trigger guard and roll pin", "buffer, buffer spring, buffer retainer and spring", "stock, castle nut, end plate, receiver extension" ], "tools": [ "roll-pin punches/starters", "pivot pin detent tool", "castle nut wrench" ] }, { "assembly": "Upper receiver", "removes": [ "charging handle", "bolt carrier group (firing pin, retaining pin, cam pin, bolt, extractor, spring, insert, ejector, ejector spring and pin", "ejection port cover, pin, spring and clip", "forward assist, spring and pin", "rear sight", "handguard/rail", "gas block or front sight base and pins, gas tube and pin", "barrel nut and barrel", "muzzle device and crush washer" ], "tools": [ "upper receiver vise block", "armorer's/barrel nut wrench", "torque wrench", "bench block", "taper-pin punch" ] } ], "hardware": { "pins": 9, "springs": 10, "detents": 4, "basis": "counted from the ArmaLite AR-10 parts lists in partCount" }, "specialTools": [ { "tool": "Upper receiver vise block / reaction rod", "usedFor": "Holding the upper for barrel nut and muzzle device work" }, { "tool": "AR armorer's wrench (barrel nut/castle nut)", "usedFor": "Barrel nut and receiver extension castle nut" }, { "tool": "Torque wrench (ft-lb and in-lb)", "usedFor": "Barrel nut, castle nut, muzzle device" }, { "tool": "Pivot pin detent installation tool (or 3/32\" punch)", "usedFor": "Holding the pivot pin detent while the pin goes in" }, { "tool": "Roll-pin starter punches (1/16\", 3/32\", 1/8\") and a bench block", "usedFor": "Bolt catch, trigger guard, forward assist and ejection port cover pins" }, { "tool": "Lower receiver vise block", "usedFor": "Supporting the trigger guard ears and bolt catch boss" } ], "fitOnRebuild": [ { "check": "Headspace after barrel or bolt change", "why": "ArmaLite: headspace must be checked by a qualified gunsmith if the bolt carrier assembly or barrel is replaced (printed on the upper parts list image)", "source": null }, { "check": "Barrel nut torque and gas tube alignment", "why": "The barrel nut is torqued within a range and indexed for the gas tube", "source": { "title": "TM 9-1005-249-23&P, Rifle, 5.56mm, M16 and M16A1 (unit and direct support, incl. RPSTL)", "publisher": "Department of the Army", "reliability": "primary", "url": "https://archive.org/download/ArmyTechnicalManualforM16Rifle-Tm9-1005-249-23p/Manual-Tm9-1005-249-23p_djvu.txt", "page": null, "pdfPage": null, "pageUrl": null, "quote": "torque barrel nut assembly (8) to 30 ft-lb." } }, { "check": "Function check (safety, hammer reset, disconnector)", "why": "The hammer spring orientation and disconnector seating are checked with a function check", "source": null }, { "check": "Sight/optic re-zero", "why": "The front sight base, rail or optic moves when the barrel/handguard comes off", "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": "Press the magazine release and remove the magazine.", "partsFreed": [ "Magazine" ] }, { "n": 3, "instruction": "Pull the charging handle fully rearward and lock the bolt back." }, { "n": 4, "instruction": "Inspect the chamber and magazine well with a light, then physically confirm the chamber is empty." }, { "n": 5, "instruction": "Place the selector on SAFE if the hammer is cocked, 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 and release the bolt forward." }, { "n": 2, "instruction": "Push the rear takedown pin from the left side to its captured position." }, { "n": 3, "instruction": "Pivot the upper receiver forward on the front pivot pin." }, { "n": 4, "instruction": "Push the front pivot pin out 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": "Carrier first, then charging handle.", "partsFreed": [ "Charging handle" ] }, { "n": 7, "instruction": "Remove the firing pin retaining pin, tip out the firing pin, rotate and lift the cam pin, and withdraw the bolt.", "warning": "Keep the cam pin with the rifle. A rifle assembled without it is dangerous.", "partsFreed": [ "Firing pin", "Cam pin", "Bolt" ] } ] } ] }, { "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 }, { "name": "Firing pin", "procedure": "field-strip", "level": "field-strip", "step": 7 }, { "name": "Cam pin", "procedure": "field-strip", "level": "field-strip", "step": 7 }, { "name": "Bolt", "procedure": "field-strip", "level": "field-strip", "step": 7 } ], "manufacturerPartsList": null, "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": "Insert the bolt into the carrier, push it fully in, drop the cam pin into its hole and rotate it 90 degrees." }, { "n": 2, "instruction": "Drop the firing pin in tail first and install the firing pin retaining pin.", "warning": "If the retaining pin will not go in, the cam pin is missing or unrotated." }, { "n": 3, "instruction": "Insert the charging handle, then the carrier, and slide both fully home." }, { "n": 4, "instruction": "Mate the upper to the lower, press both pins home." }, { "n": 5, "instruction": "Charge the rifle and perform the function check." } ], "instruction": null } ] }, { "id": "torque", "title": "Torque", "coverage": "reported-only", "manufacturer": [], "reported": [ { "fastener": "Barrel nut (MI-CR308 barrel nut, replacing factory barrel nut and delta ring)", "appliesTo": ".308 AR (AR-308) fitted with a Midwest Industries MI-CR308 handguard", "qualifier": "maximum", "value": 50, "valueMax": null, "unit": "ft-lb", "converted": { "value": { "N-m": 67.8, "in-lb": 600, "ft-lb": 50 }, "valueMax": null }, "sequence": "Grease the receiver threads, install the MI-CR308 barrel nut hand tight, then torque with the provided ½\" drive barrel nut wrench to 50 ft lbs (DO NOT EXCEED).", "threadlocker": null, "source": { "title": "MI-CR308 Installation Instructions", "publisher": "Midwest Industries, Inc.", "reliability": "secondary", "url": "https://midwestindustriesinc.com/content/installation-instructions/AR308-MI-CR308-Instructions.pdf", "page": "PDF p. 1", "pdfPage": 1, "pageUrl": "https://midwestindustriesinc.com/content/installation-instructions/AR308-MI-CR308-Instructions.pdf#page=1", "quote": "Torque the barrel nut with the provided ½” drive barrel nut wrench to 50 ft lbs (DO NOT EXCEED)." } }, { "fastener": "Handguard clamp bolts (2) with torque plate", "appliesTo": ".308 AR fitted with a Midwest Industries MI-CR308 handguard", "qualifier": "exact", "value": 40, "valueMax": null, "unit": "in-lb", "converted": { "value": { "N-m": 4.5, "in-lb": 40, "ft-lb": 3.3 }, "valueMax": null }, "sequence": "Drop the torque plate in the handguard clamp; install screws; tighten the receiver-end bolt first; torque while ensuring proper alignment. 'DO NOT INSTALL AND TIGHTEN THESE SCREWS WITH OUT THE TORQUE PLATE.'", "threadlocker": null, "source": { "title": "MI-CR308 Installation Instructions", "publisher": "Midwest Industries, Inc.", "reliability": "secondary", "url": "https://midwestindustriesinc.com/content/installation-instructions/AR308-MI-CR308-Instructions.pdf", "page": "PDF p. 1", "pdfPage": 1, "pageUrl": "https://midwestindustriesinc.com/content/installation-instructions/AR308-MI-CR308-Instructions.pdf#page=1", "quote": "Tighten the receiver end bolt first. Torque bolts to 40 in lbs while ensuring proper alignment." } }, { "fastener": "Barrel nut (Aero Precision M5E1 barrel nut)", "appliesTo": "Aero Precision M5E1 (AR-10/.308) upper receiver", "qualifier": "exact", "value": 65, "valueMax": null, "unit": "ft-lb", "converted": { "value": { "N-m": 88.1, "in-lb": 780, "ft-lb": 65 }, "valueMax": null }, "sequence": "AR15 mil-spec barrel-nut wrench.", "threadlocker": null, "source": { "title": "Aero Precision Support Center — Torque Specifications (article updated 2024-04-01; read via the help centre's Zendesk API because support.aeroprecisionusa.com refused the TLS handshake from this environment)", "publisher": "Aero Precision", "reliability": "secondary", "url": "https://support.aeroprecisionusa.com/hc/en-us/articles/14130432684951-Torque-Specifications", "page": "Barrel Nut Torque Specifications", "pdfPage": null, "pageUrl": null, "quote": "M5E1 Barrel Nut: 65 ft. lbs (AR15 Mil-Spec Barrel Nut Wrench)" } }, { "fastener": "Handguard screws (Aero Precision M5 Enhanced Gen 2, Torx T15)", "appliesTo": "AR-10/.308 (Aero M5) with an Aero Precision M5 Enhanced Gen 2 handguard", "qualifier": "exact", "value": 25, "valueMax": null, "unit": "in-lb", "converted": { "value": { "N-m": 2.8, "in-lb": 25, "ft-lb": 2.1 }, "valueMax": null }, "sequence": null, "threadlocker": null, "source": { "title": "Aero Precision Support Center — Torque Specifications (article updated 2024-04-01; read via the help centre's Zendesk API because support.aeroprecisionusa.com refused the TLS handshake from this environment)", "publisher": "Aero Precision", "reliability": "secondary", "url": "https://support.aeroprecisionusa.com/hc/en-us/articles/14130432684951-Torque-Specifications", "page": "Screw Torque Specifications", "pdfPage": null, "pageUrl": null, "quote": "M5 Enhanced Gen 2 hand guard screws: 25 in lbs. (Torx T15)" } }, { "fastener": "Barrel nut (Aero Precision M5 R-ONE / S-ONE handguard barrel nut)", "appliesTo": "Aero M5 (AR-10/.308) upper with an Aero Precision ATLAS R-ONE or S-ONE M5 handguard", "qualifier": "range", "value": 35, "valueMax": 65, "unit": "ft-lb", "converted": { "value": { "N-m": 47.5, "in-lb": 420, "ft-lb": 35 }, "valueMax": { "N-m": 88.1, "in-lb": 780, "ft-lb": 65 } }, "sequence": "The article gives one torque range for R-ONE/S-ONE and notes the M5 versions use a standard armorer's wrench instead of the wrench extension; shims to reach gas-tube alignment.", "threadlocker": null, "source": { "title": "Aero Precision Support Center — How to install a R-ONE/S-ONE Handguard (updated 2025-01-09; read via the help centre's Zendesk API)", "publisher": "Aero Precision", "reliability": "secondary", "url": "https://support.aeroprecisionusa.com/hc/en-us/articles/14130449931671-How-to-install-a-R-ONE-S-ONE-Handguard", "page": "article body", "pdfPage": null, "pageUrl": null, "quote": "Next, you will need to tighten your barrel nut to 35-65 ft lbs. using the supplied wrench extension." } }, { "fastener": "M-LOK rail-section screws on the handguard (MI-CR308)", "appliesTo": "AR-308 / AR-10 with a Midwest Industries MI-CR308 handguard", "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": null, "threadlocker": null, "source": { "title": "MI-CR308 Installation Instructions", "publisher": "Midwest Industries, Inc.", "reliability": "secondary", "url": "https://midwestindustriesinc.com/content/installation-instructions/AR308-MI-CR308-Instructions.pdf", "page": "PDF p. 1, step 11", "pdfPage": 1, "pageUrl": "https://midwestindustriesinc.com/content/installation-instructions/AR308-MI-CR308-Instructions.pdf#page=1", "quote": "torque the M-Lok screws to 15 in lbs." } }, { "fastener": "Barrel nut (ODIN Works 308 M-LOK forend barrel nut)", "appliesTo": "AR-10 with an ODIN Works 308 M-LOK forend (installed with the 1 3/8\" jumbo crowfoot)", "qualifier": "range", "value": 40, "valueMax": 50, "unit": "ft-lb", "converted": { "value": { "N-m": 54.2, "in-lb": 480, "ft-lb": 40 }, "valueMax": { "N-m": 67.8, "in-lb": 600, "ft-lb": 50 } }, "sequence": null, "threadlocker": null, "source": { "title": "ODIN Works 1 3/8\" Jumbo Crowfoot Wrench (for ODIN Works 308 MLOK Forend installation) — product page", "publisher": "ODIN Works", "reliability": "secondary", "url": "https://www.odinworks.com/1-3-8-Jumbo-Crow-Foot-Wrench-p/acc-1-3-8-crowfoot-308.htm", "page": "Features", "pdfPage": null, "pageUrl": null, "quote": "Use this crowfoot wrench to torque the barrel nut to 40-50 ft lbs" } }, { "fastener": "Barrel nut (Faxon Streamline AR10 handguard, DPMS high profile)", "appliesTo": "AR10 (DPMS high-profile .308 upper) with a Faxon Streamline Aluminum M-LOK AR10 handguard", "qualifier": "maximum", "value": 50, "valueMax": null, "unit": "ft-lb", "converted": { "value": { "N-m": 67.8, "in-lb": 600, "ft-lb": 50 }, "valueMax": null }, "sequence": "1-3/8\" wrench. Faxon: 'DO NOT OVER-TIGHTEN.'", "threadlocker": null, "source": { "title": "Faxon Streamline Aluminum M-LOK 15\" AR10 Handguard (DPMS High Profile) — product page 'Installation Instructions' (same text on the 6.5\" and 10.5\" pages)", "publisher": "Faxon Firearms", "reliability": "secondary", "url": "https://faxonfirearms.com/FFHGMLOK15G310", "page": "Installation Instructions", "pdfPage": null, "pageUrl": null, "quote": "Torque barrel nut to industry specs using 1-3/8 wrench to no more than 50 foot/lbs." } }, { "fastener": "Handguard clamp screws (Faxon Streamline AR10)", "appliesTo": "AR10 (DPMS high-profile) with a Faxon Streamline Aluminum M-LOK AR10 handguard", "qualifier": "exact", "value": 32, "valueMax": null, "unit": "in-lb", "converted": { "value": { "N-m": 3.6, "in-lb": 32, "ft-lb": 2.7 }, "valueMax": null }, "sequence": "Re-check torque after the first live-fire test.", "threadlocker": null, "source": { "title": "Faxon Streamline Aluminum M-LOK 15\" AR10 Handguard (DPMS High Profile) — product page 'Installation Instructions' (same text on the 6.5\" and 10.5\" pages)", "publisher": "Faxon Firearms", "reliability": "secondary", "url": "https://faxonfirearms.com/FFHGMLOK15G310", "page": "Installation Instructions", "pdfPage": null, "pageUrl": null, "quote": "Install handguard, locking block and clamp screws. torque to 32 inch/lbs." } }, { "fastener": "Barrel nut — final torque (BATTLEARMS RIGIDRAIL)", "appliesTo": "AR-10 with a BATTLEARMS RIGIDRAIL free-float handguard", "qualifier": "exact", "value": 45, "valueMax": null, "unit": "ft-lb", "converted": { "value": { "N-m": 61, "in-lb": 540, "ft-lb": 45 }, "valueMax": null }, "sequence": "After the 40 ft-lb pass and loosening one-half turn; ceiling 50 ft-lb.", "threadlocker": null, "source": { "title": "BATTLEARMS RIGIDRAIL Free Float Rail Handguards for the M16 . M4 . AR-15 or AR-10 Weapon Platforms — Instructions (maker's PDF re-hosted by distributor OpticsPlanet; no copy found on battlearmsdevelopment.com)", "publisher": "Battle Arms Development, Inc. (BAD / BATTLEARMS)", "reliability": "secondary", "url": "https://www.opticsplanet.com/i/pdf/opplanet-battle-arms-development-rigidrail-ar15-m16-free-float-rail-handguards-installation-pdf.pdf", "page": "PDF p. 2, step 8", "pdfPage": 2, "pageUrl": "https://www.opticsplanet.com/i/pdf/opplanet-battle-arms-development-rigidrail-ar15-m16-free-float-rail-handguards-installation-pdf.pdf#page=2", "quote": "Loosen the barrel nut one-half turn and re-torque to 45 ft-lbs. (Do not exceed 50 ft-lbs." } }, { "fastener": "Rail retention clamp hex bolts (2) (BATTLEARMS RIGIDRAIL)", "appliesTo": "AR-10 with a BATTLEARMS RIGIDRAIL free-float handguard", "qualifier": "exact", "value": 30, "valueMax": null, "unit": "in-lb", "converted": { "value": { "N-m": 3.4, "in-lb": 30, "ft-lb": 2.5 }, "valueMax": null }, "sequence": "Alternate between the two bolts until both stop rotating at the set torque.", "threadlocker": "Blue Loctite recommended on the hex bolts.", "source": { "title": "BATTLEARMS RIGIDRAIL Free Float Rail Handguards for the M16 . M4 . AR-15 or AR-10 Weapon Platforms — Instructions (maker's PDF re-hosted by distributor OpticsPlanet; no copy found on battlearmsdevelopment.com)", "publisher": "Battle Arms Development, Inc. (BAD / BATTLEARMS)", "reliability": "secondary", "url": "https://www.opticsplanet.com/i/pdf/opplanet-battle-arms-development-rigidrail-ar15-m16-free-float-rail-handguards-installation-pdf.pdf", "page": "PDF p. 3, step 13", "pdfPage": 3, "pageUrl": "https://www.opticsplanet.com/i/pdf/opplanet-battle-arms-development-rigidrail-ar15-m16-free-float-rail-handguards-installation-pdf.pdf#page=3", "quote": "Insert the rail retention clamp into the the RIGIDRAIL™ and tighten the hex bolts to 30 in-lbs." } }, { "fastener": "Receiver extension (Magpul UBR GEN2 buffer tube) into the lower receiver", "appliesTo": "SR25/M110-pattern (AR-10) lower with a Magpul UBR GEN2 stock", "qualifier": "range", "value": 35, "valueMax": 39, "unit": "ft-lb", "converted": { "value": { "N-m": 47.5, "in-lb": 420, "ft-lb": 35 }, "valueMax": { "N-m": 52.9, "in-lb": 468, "ft-lb": 39 } }, "sequence": "Hold the buffer retaining pin depressed while threading the tube in; 1/2\" torque driver in the square recess. Magpul cites US Army TM 9-1005-319-23&P for the value.", "threadlocker": "None — 'DO NOT USE LOCTITE OR OTHER LOCKING COMPOUND ON RECEIVER EXTENSION THREADS.'", "source": { "title": "Magpul UBR GEN2 Collapsible Stock — Installation & Usage Instructions for the AR15/M4 & SR25/M110 (072-0105-B)", "publisher": "Magpul Industries Corp.", "reliability": "secondary", "url": "https://magpul.com/media/wysiwyg/Instructions/MAG482_UBR_GEN2_Stock%20INSRT.pdf", "page": "PDF p. 4", "pdfPage": 4, "pageUrl": "https://magpul.com/media/wysiwyg/Instructions/MAG482_UBR_GEN2_Stock%20INSRT.pdf#page=4", "quote": "tighten with a ½” torque driver and torque to 35-39 ft-lb." } }, { "fastener": "UBR GEN2 Main Tube Nut", "appliesTo": "SR25/M110-pattern (AR-10) with a Magpul UBR GEN2 stock", "qualifier": "range", "value": 20, "valueMax": 25, "unit": "ft-lb", "converted": { "value": { "N-m": 27.1, "in-lb": 240, "ft-lb": 20 }, "valueMax": { "N-m": 33.9, "in-lb": 300, "ft-lb": 25 } }, "sequence": "Included adapter tool plus an armorer's (castle-nut) wrench.", "threadlocker": null, "source": { "title": "Magpul UBR GEN2 Collapsible Stock — Installation & Usage Instructions for the AR15/M4 & SR25/M110 (072-0105-B)", "publisher": "Magpul Industries Corp.", "reliability": "secondary", "url": "https://magpul.com/media/wysiwyg/Instructions/MAG482_UBR_GEN2_Stock%20INSRT.pdf", "page": "PDF p. 5, step 7", "pdfPage": 5, "pageUrl": "https://magpul.com/media/wysiwyg/Instructions/MAG482_UBR_GEN2_Stock%20INSRT.pdf#page=5", "quote": "tighten the Main Tube Nut to 20-25 ft-lb." } } ], "notes": "The manufacturer's documents give no torque value. They say: \"WARNING: EXCESSIVE TIGHTENING OF THE LOCK RING WITH A STRAP WRENCH CAN LOOSEN THE BARREL NUT OR DEFORM THE GAS TUBE.\" (Operator's Manual — Rifle, 7.62mm SuperSASS / Carbine, 7.62mm SuperSASS (ArmaLite AR-10 SuperSASS), PDF p. 48) \"To install the backup sights, slip the base over the receiver or gas block, and tighten down until firm by using a 7/32\" hex head wrench\" (Operator's Manual — Rifle, 7.62mm SuperSASS / Carbine, 7.62mm SuperSASS (ArmaLite AR-10 SuperSASS), PDF p. 11 (section 5.1))" }, { "id": "function-check", "title": "Function check", "checks": [ "Verify the rifle is unloaded with no magazine inserted before each step.", "Charge the rifle, place the selector on SAFE, and press the trigger. The hammer must not fall.", "Move to SEMI and press the trigger. The hammer should fall.", "Hold the trigger back, charge the rifle, release slowly and listen for the disconnector.", "Confirm the bolt locks back on an empty magazine." ], "videos": [] } ], "troubleshooting": [], "sources": [ { "n": 1, "id": null, "title": "AR-10 / LR-308 Pattern Rifle Owner’s Manuals (various manufacturers)", "publisher": "Various", "reliability": "primary", "url": null, "accessed": null }, { "n": 2, "id": "midwest-industries-inc-081036", "title": "MI-CR308 Installation Instructions", "publisher": "Midwest Industries, Inc.", "reliability": "secondary", "url": "https://midwestindustriesinc.com/content/installation-instructions/AR308-MI-CR308-Instructions.pdf", "accessed": "2026-09-27" }, { "n": 3, "id": "armalite-inc-2006-scan-hosted-on-arc-db61f9", "title": "Operator's Manual — Rifle, 7.62mm SuperSASS / Carbine, 7.62mm SuperSASS (ArmaLite AR-10 SuperSASS)", "publisher": "ArmaLite, Inc. (© 2006) — scan hosted on archive.org", "reliability": "primary", "url": "https://archive.org/details/gunmanual_Armalite_AR10_Super_Sass", "accessed": "2026-09-27" }, { "n": 4, "id": "aero-precision-56c863", "title": "Aero Precision Support Center — Torque Specifications (article updated 2024-04-01; read via the help centre's Zendesk API because support.aeroprecisionusa.com refused the TLS handshake from this environment)", "publisher": "Aero Precision", "reliability": "secondary", "url": "https://support.aeroprecisionusa.com/hc/en-us/articles/14130432684951-Torque-Specifications", "accessed": "2026-10-11" }, { "n": 5, "id": "aero-precision-1324b9", "title": "Aero Precision Support Center — How to install a R-ONE/S-ONE Handguard (updated 2025-01-09; read via the help centre's Zendesk API)", "publisher": "Aero Precision", "reliability": "secondary", "url": "https://support.aeroprecisionusa.com/hc/en-us/articles/14130449931671-How-to-install-a-R-ONE-S-ONE-Handguard", "accessed": "2026-10-11" }, { "n": 6, "id": "odin-works-2b86f9", "title": "ODIN Works 1 3/8\" Jumbo Crowfoot Wrench (for ODIN Works 308 MLOK Forend installation) — product page", "publisher": "ODIN Works", "reliability": "secondary", "url": "https://www.odinworks.com/1-3-8-Jumbo-Crow-Foot-Wrench-p/acc-1-3-8-crowfoot-308.htm", "accessed": "2026-10-11" }, { "n": 7, "id": "faxon-firearms-800730", "title": "Faxon Streamline Aluminum M-LOK 15\" AR10 Handguard (DPMS High Profile) — product page 'Installation Instructions' (same text on the 6.5\" and 10.5\" pages)", "publisher": "Faxon Firearms", "reliability": "secondary", "url": "https://faxonfirearms.com/FFHGMLOK15G310", "accessed": "2026-10-11" }, { "n": 8, "id": "battle-arms-development-inc-bad-batt-4b49d3", "title": "BATTLEARMS RIGIDRAIL Free Float Rail Handguards for the M16 . M4 . AR-15 or AR-10 Weapon Platforms — Instructions (maker's PDF re-hosted by distributor OpticsPlanet; no copy found on battlearmsdevelopment.com)", "publisher": "Battle Arms Development, Inc. (BAD / BATTLEARMS)", "reliability": "secondary", "url": "https://www.opticsplanet.com/i/pdf/opplanet-battle-arms-development-rigidrail-ar15-m16-free-float-rail-handguards-installation-pdf.pdf", "accessed": "2026-10-11" }, { "n": 9, "id": "magpul-industries-corp-b02b3f", "title": "Magpul UBR GEN2 Collapsible Stock — Installation & Usage Instructions for the AR15/M4 & SR25/M110 (072-0105-B)", "publisher": "Magpul Industries Corp.", "reliability": "secondary", "url": "https://magpul.com/media/wysiwyg/Instructions/MAG482_UBR_GEN2_Stock%20INSRT.pdf", "accessed": "2026-10-11" }, { "n": 10, "id": "pat-american-rifleman-national-rifle-ass-7acdba", "title": "The AR-10 Story", "publisher": "American Rifleman (National Rifle Association)", "reliability": "secondary", "url": "https://www.americanrifleman.org/content/the-ar-10-story/", "accessed": "2026-10-13" }, { "n": 11, "id": "tier-28af49b9", "title": "ArmaLite AR-10 / AR-10B Owner's Guide", "publisher": "ArmaLite, Inc.", "reliability": "primary", "url": "https://s3.amazonaws.com/files.ammunitiondepot.com/armalite-rifles/owners-manuals/armalite-ar10-ar10b-owners-guide.pdf", "accessed": "2026-10-29" }, { "n": 12, "id": "tier-69c2cd81", "title": "AR Lower Receiver Build: Pivot Pin Installation", "publisher": "Shooting Illustrated (NRA)", "reliability": "secondary", "url": "https://www.shootingillustrated.com/content/ar-lower-receiver-build-pivot-pin-installation/", "accessed": "2026-10-29" }, { "n": 13, "id": "tier-616a4c9f", "title": "TM 9-1005-249-23&P, Rifle, 5.56mm, M16 and M16A1 (unit and direct support, incl. RPSTL)", "publisher": "Department of the Army", "reliability": "primary", "url": "https://archive.org/download/ArmyTechnicalManualforM16Rifle-Tm9-1005-249-23p/Manual-Tm9-1005-249-23p_djvu.txt", "accessed": "2026-10-29" }, { "n": 14, "id": "tier-c7d46d0f", "title": "TFB Armorer's Bench: Complete AR15 Assembly - Lower Receiver", "publisher": "The Firearm Blog", "reliability": "secondary", "url": "https://www.thefirearmblog.com/blog/2022/07/31/tfb-armorers-bench-complete-ar15-assembly-lower-receiver/", "accessed": "2026-10-29" } ] }