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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On Sale
Magpul MBUS Pro Flip Up Rear Sight
Magpul Industries
Now: $109.20Was: $114.95The Magpul MBUS Pro Flip-Up Rear Sight (MAG276-BLK) is Magpul's professional-grade steel flip-up back-up iron sight for AR-15/M4 rifles. Unlike the polymer MBUS, the MBUS Pro is machined from steel for maximum durability and features a fully adjustable...Now: $109.20Was: $114.95 -
Heckler & Koch - MP5/SP5 9mm 30rd Magazine - 50223552-RAL8000
Heckler & Koch
$85.99The Heckler & Koch MP5/SP5 9mm 30-Round Magazine — RAL8000 (HK PN: 50223552-RAL8000) is the genuine HK factory 30-round 9mm magazine for the MP5 and SP5/SP5K semi-automatic platforms, finished in RAL8000 (olive/greenish-gray) color. HK's...$85.99 -
Out of stock
Knight's Armament - 8-Rib Rail Section Kit - #30412
Knights Armament Company
$33.31 - $40.10The KAC URX 3.1 Picatinny Rail Section attaches directly to a URX III or 3.1 modular handguard via a hex head screw. It allows the user to install any number of tactical accessories to the forend if desired. Installation hardware included. Lightweight...$33.31 - $40.10 -
Out of stockOn Sale
LMT Defense - M203 Barrel 7” - #LMP350
LMT Defense
MSRP: $598.00Now: $538.20Was: $554.40LMT Defense M203 GRENADE LAUNCHER BARREL ASSEMBLY, 7″ This barrel is exclusively compatible with our L2X1 model “Shorty 40” grenade launcher.MSRP: $598.00Now: $538.20Was: $554.40 -
Out of stock
Volquartsen - 10/22 Superlite Competition Kit - VC10PCK-A-B
Volquartsen
$724.00Looking to build your own semi-auto 22 LR? The Precision Competition Kit is a great way to start. All you need to do is add the 10/22 compatible barrel and stock of your choice and you are ready to shoot. The Precision Competition Kit comes complete with...$724.00 -
Radian Weapons - Talon Ambidextrous Safety Selector - R0018
Radian Weapons
$59.95The Talon ambidextrous safety selector is a modular design that can be installed as a standard 90 degree or as a 45 degree short throw by simply rotating the shaft 180 degree inside the lower receiver. Selector levers install using a precision machined...$59.95 -
Heckler & Koch - HK45 Tactical Threaded Barrel - 5.11" - 226351
Heckler & Koch
$280.00The Heckler & Koch HK45 Tactical Threaded Barrel — 5.11" (HK PN: 226351) is the genuine HK factory replacement threaded barrel for the HK45 Tactical pistol, providing a 5.11" barrel length and standard threaded muzzle for attaching suppressors,...$280.00 -
Out of stock
LMT Defense - Tactical Charging Handle Assembly - .308 - #LM308CA
LMT Defense
MSRP: $130.00$123.30The Lewis Machine and Tool Tactical AR-10 charging handle makes charging your weapon much easier in stressful situations or when you simply want to go faster. The large tactical latch is easy to grab or use with the palm of your hand for fast weapon...MSRP: $130.00$123.30 -
Out of stockOn Sale
Q LLC - Cherry Bomb Muzzle Brake - 8.6 Blackout - #CB-M18-1-5
Q LLC
MSRP: $100.00Now: $90.00Was: $100.00Q LLC Cherry Bomb muzzle brake chambered in 8.6 Blackout. This is a Quickie Fast-Attach muzzle brake compatible with the THUNDER CHICKEN and trash PANDA silencers by Q. It features our taper mount shoulder to align with our barrels and...MSRP: $100.00Now: $90.00Was: $100.00 -
Out of stock
HALEY STRATEGIC PARTNERS THORNTAIL X OFFSET LIGHT MOUNT #LM_TX_MLOK_STD-1-1-BLK
Haley Strategic Partners
$55.00The Thorntail X M-LOK Offset Light Mount provides optimal weapon light positioning in a minimalist footprint. The M-LOK Offset Light Mount enables light placement in four positions around the rail and includes four mounting offsets enabling adequate...$55.00 -
Out of stock
LMT Defense - 10.5" Chrome Lined MRP .300 Blackout Barrel Assembly - R-L7BH1B
LMT Defense
$554.40The LMT Defense 10.5" .300 Blackout Chrome Lined MRP Barrel Assembly (R-L7BH1B) is purpose-built for suppressed or subsonic shooting in a compact SBR package. This 10.5-inch chrome lined .300 Blackout barrel features a 1:7" right-hand rifling twist,...$554.40 -
LMT Defense - Tactical Charging Handle Assembly - AR15 - LMP103T
LMT Defense
MSRP: $97.00$90.00The LMT Defense Tactical 5.56 Charging Handle (LMP103T) is an M4 Charging Handle Assembly with an Enhanced Tactical Latch — offering a significant upgrade over mil-spec charging handles. The enlarged tactical latch provides a more positive grip and...MSRP: $97.00$90.00