Parts & Accessories
Shop AR-15 and AR-10 parts and accessories from Boss Firearms. Our parts inventory includes LMT upper and lower receivers, Proof Research carbon fiber barrels, Forward Controls Design components, Geissele triggers, Magpul furniture, BCM parts, SureFire lights, and much more. Whether you're building a new rifle or upgrading your current setup, we carry the hard-to-find components trusted by military, law enforcement, and serious civilian shooters.
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LMT Defense - 12" Piston MRP 5.56mm Barrel Assembly - #R-L7MC1B
LMT Defense
$716.8512″ Piston Chrome Lined 5.56×45 (.223) 1:7″ RH twist barrel Designed for the LMT monolithic receiver, this barrel utilizes a piston operating rod and has an A2 birdcage for reduced flash. The barrel...$716.85 -
Knights Armament - Barrel Extension Action Wrench - 30447
Knights Armament Company
MSRP: $101.35$96.28The Knight's Armament Barrel Extension Action Wrench (KAC PN: 30447) is KAC's purpose-designed action wrench for removing and installing barrel extensions on SR-15, SR-25, and other KAC platforms...MSRP: $101.35$96.28 -
Knight Armament - 5.56 QDC 3-Prong Flash Suppressor Kit - 1/2"-28 TPI - 30555
Knights Armament Company
$129.96The Knight's Armament 5.56mm QDC 3-Prong Flash Suppressor Kit (KAC PN: 30555) is KAC's signature 3-prong flash eliminator for 5.56mm rifles with 1/2"-28 TPI muzzle threading. The KAC 3-Prong Flash...$129.96 -
VLTOR - 7-Position A5 Receiver Extenstion - RE-A5
Vltor Weapon Systems
$56.66The VLTOR RE-A5 7-Position A5 Receiver Extension is the buffer tube component of VLTOR's innovative A5 system, designed for use with VLTOR's A5 buffer and spring for improved cycling characteristics...$56.66 -
LMT Defense - M203 BARREL 9” - LMP380
LMT Defense
MSRP: $598.00$554.40The LMT Defense M203 Barrel 9" (LMP380) is a 40mm grenade launcher barrel assembly — NSN: 1010-01-611-3461. This 9-inch M203 barrel is compatible with LMT's Classic M203 Receiver (LMP300E) and Rail...MSRP: $598.00$554.40 -
Knight's Armament - 9 Rib Rail Panel - 97169
Knights Armament Company
$27.99The Knight's Armament 9-Rib Rail Panel (KAC PN: 97169) is KAC's extended 9-rib polymer rail panel for covering unused slots on KAC RAS Picatinny quad-rail handguards. The 9-rib panel covers a larger...$27.99 -
LMT Defense - 5.56mm 12.5" Chrome Lined MRP Barrel Assembly - L7MJ1B
LMT Defense
$554.40This is a new Lewis Machine & Tool 12.5-inch MRP barrel chambered for .223/5.56mm. It features a 1/2x28 threaded A2 birdcage flash hider, low profile gas block with a mid-length straight gas tube,...$554.40 -
Sig Sauer - P365 X-Macro 9MM 17RD Magazine - 8900804
Sig Sauer
$59.99The Sig Sauer P365 X-Macro 9mm 17-Round Magazine (8900804) is a factory Sig Sauer flush-fit magazine for the P365 X-Macro pistol, providing 17 rounds of 9mm Luger in a flush-fitting polymer magazine...$59.99 -
Knights Armament - M5 Rifle RAS Forend Assembly - #98065
Knights Armament Company
MSRP: $344.66$329.28The KAC M5 RAS (Rail Adapter System) was developed for use on the US military?s M16A4, and with hundreds of thousands of rails issued to date, it is one of the most battle proven designs available...MSRP: $344.66$329.28 -
Forward Controls Design - MLOK Fixed Loop, Heavy - MFH
Forward Controls Design, Inc
MSRP: $50.00$47.50The Forward Controls Design M-LOK Fixed Loop Heavy Sling Adapter (MFH) is FCD's heavy-duty fixed loop sling attachment point for M-LOK compatible handguards. The MFH (MLOK Fixed loop, Heavy, Forward...MSRP: $50.00$47.50 -
BT Atlas - V8 Atlas Bipod w/ADM-170-S Lever - BT10-LW17
BT Atlas
$294.95The BT10-LW17 V8 Atlas Bipod mounts directly to any 1913 style Picatinny rail via the included ADM-170-S lever. It is comprised of 6061-T6 aluminum that is Mil-Spec Type III hard coat anodized and...$294.95 -
LMT Defense - 5.56mm 11.5" Chrome Lined MRP Barrel Assembly - L7TA1B
LMT Defense
$554.40The LMT Defense 11.5" Chrome Lined 5.56mm MRP Barrel Assembly (L7TA1B) is engineered specifically for LMT's Monolithic Rail Platform (MRP) upper receivers. This 11.5-inch, 5.56×45 (.223) barrel...$554.40