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 - MARS-(L/H) Ambidextrous AR-15 Magazine Release - LM308A6
LMT Defense
MSRP: $24.00$22.32The LMT Defense MARS-(L/H) Ambidextrous AR-15 Magazine Release (LM308A6) is a genuine LMT OEM replacement ambidextrous magazine release for MARS-L and MARS-H lower receivers. The ambidextrous...MSRP: $24.00$22.32 -
LMT Defense - 20" Stainless Steel MWS 6.5 Creedmoor Barrel Assembly - LM650B220S
LMT Defense
MSRP: $947.00$877.95The LMT Defense 20" Stainless Steel 6.5 Creedmoor MWS Barrel Assembly (LM650B220S) is engineered for extreme long-range precision. This 20-inch stainless steel barrel features a 1:8" right-hand twist...MSRP: $947.00$877.95 -
AirTronic USA - MIL-SPEC Rifle Length M203 Handguard/Heatshield - IC5Q6-HG
AirTronic USA
$150.00This is a new AirTronic USA, mil-spec, rifle-length, M203 handguard/heatshield. The internal is formed to conform to the contour of the barrel of an M16 rifle and the external is formed to a special...$150.00 -
Forward Controls Design - Secure Staking BCG - SBCG
Forward Controls Design, Inc
MSRP: $275.00$261.25The Forward Controls Design Secure Staking Bolt Carrier Group (SBCG) is FCD's premium enhanced bolt carrier group for AR-15/M16 5.56 NATO platforms. The SBCG (Secure-staking BCG, Forward Controls)...MSRP: $275.00$261.25 -
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...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...$85.99 -
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...$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...$280.00 -
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...MSRP: $130.00$123.30 -
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...$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...MSRP: $97.00$90.00 -
Forward Controls Design - Trigger Guard - TGF Winter
Forward Controls Design, Inc
MSRP: $25.00$23.75The Forward Controls Design Trigger Guard — Winter (TGF Winter) is FCD's enhanced winter trigger guard for AR-15/M16 pattern lower receivers. The TGF (Trigger Guard, Forward Controls) Winter variant...MSRP: $25.00$23.75