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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Out of stockOn Sale
Knights Armament - 7.62MM QDC Flash Suppressor Kit - 112954
Knights Armament Company
Now: $177.75Was: $187.11The Knights Armament QDC Flash Suppressor is compatible with KAC's QDC suppressor and is threaded in 5/8x24. Note, this muzzle device will not fit the SR25. Weights 3.6oz and includes a shim kit and Rocksett.Now: $177.75Was: $187.11 -
Out of stockOn Sale
LMT Lewis Machine & Tool DMR Buttstock
LMT Defense
Now: $391.50Was: $435.00LMT Lewis Machine & Tool DMR Buttstock Designated Marksman Rifle buttstock. Designed for .308 caliber rifles with carbine extension tubes. The DMR stock has comb height and length of pull adjustments for fine tuning of the shooter experience. This is...Now: $391.50Was: $435.00 -
Out of stockOn Sale
LMT Defense 5.56mm 14.5" Piston MRP Barrel Assembly
LMT Defense
Now: $695.70Was: $716.85Lewis Machine & Tool piston operated 14.5-inch MRP barrel chambered for .223/5.56mm. It features a 1/2x28 threaded A2 birdcage flash hider, two-position adjustable gas block for suppressed and unsuppressed firing, and a chrome lined bore with a 1:7...Now: $695.70Was: $716.85 -
Out of stock
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, and a chrome-lined bore with a 1:7 right hand twist...$554.40 -
Out of stock
AirTronic USA - M203 Barrel - #IC5Q6-BARREL-USED
Used
$350.00AirTronic USA M203 12” Barrel Marked - ASSY-19200-8448377 MFR 1C5Q6 These are used items in good condition. Please note that all NFA regulations apply; ATF approval for your M203 receiver as a Destructive Device is mandatory prior to...$350.00 -
Out of stockOn Sale
Knight's Armament M4 5.56 Carbine Rail Adapter System Assembly - Aluminum, Anodized Finish #98064
Knights Armament Company
MSRP: $310.28Now: $294.76Was: $310.28The KAC M4 RAS (Rail Adapter System) was developed for use on the US military’s M4 Carbine, and with over 1 million rails issued to date, it is one of the most battle proven designs available for the AR-15 platform. This non-free float handguard is...MSRP: $310.28Now: $294.76Was: $310.28 -
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 body. The P365 X-Macro's innovative design achieves...$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 for the AR-15 platform. This non-free float handguard is...MSRP: $344.66$329.28 -
Out of stock
LMT Defense - EURO AXLE Two Stage Semi-Auto Trigger Group - LMP2400EUS
LMT Defense
MSRP: $250.00$231.75Lewis Machine & Tool EURO model Two Stage AXLE semi-automatic Trigger Group for AR-10 and AR-15 pattern firearms. The EURO AXLE trigger features an approximate 4.5lb pull the provides a clean and precise break while still be safe to manipulate with...MSRP: $250.00$231.75 -
Out of stockOn Sale
LMT Defense - 5.56 Semi-Auto Bolt Carrier Group - L7A3
LMT Defense
Now: $242.10Was: $249.75The LMT 5.56 direct impingement bolt carrier group will fit in any mil-spec ar15 upper receiver and is made of high-quality materials with durability in mind. This bolt carrier features semi-automatic geometry.Now: $242.10Was: $249.75 -
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 Controls) provides a secure, non-rotating fixed loop...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 have heat treated stainless steel components. Available...$294.95