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 stock
Knights Armament - SR-15 Ambidextrous Charging Handle Assembly - #KM31177
Knights Armament Company
$178.20The KAC 5.56mm Ambidextrous Charging Handle is another step forward in the effort to deliver the most ergonomic firearm accessories to the end user. Intermediate sized latch pads are easily...$178.20 -
LMT Defense 5.56mm 16" Piston MRP Barrel Assembly
LMT Defense
$716.85The LMT Defense 5.56mm 16" Piston MRP Barrel Assembly (L7PC1B) is a 16-inch chrome lined 5.56×45 (.223) barrel featuring LMT's short-stroke piston operating system — the key upgrade for shooters who...$716.85 -
Forward Controls Design - Sotar Cam Pin - Fits AR15/M16 Systems- SCP-NP3
Forward Controls Design, Inc
MSRP: $17.00$16.15The Forward Controls Design Sotar Cam Pin — NP3 Finish (SCP-NP3) is FCD's premium replacement bolt carrier group cam pin for AR-15/M16 platforms, finished in Robar's NP3 electroless nickel-PTFE...MSRP: $17.00$16.15 -
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 -
Out of stock
LMT Defense Bolt Catch & Ambidextrous Magazine Release Roll Pin #LMP251
LMT Defense
$3.15Having a spare is never the wrong answer, so keep your kit ready to roll with a spare bolt catch roll pin for your AR-15.Features: MIL-SPEC construction Made in the U.S.A. Lewis Machine and Tool is...$3.15 -
Out of stockOn Sale
Knight's Armament - 5 Rib Rail Panel - Black - #97167
Knights Armament Company
Now: $26.59Was: $27.99KAC’s iconic Ribbed Rail Panels have seen use all over the globe on US military M4 Carbines. The lightweight polymer panels are ribbed for an enhanced grip, and help insulate the support hand from...Now: $26.59Was: $27.99 -
Out of stock
Glock 17/34 OEM 33rd. Olive Drab Magazine - 47462
Glock
$40.00Each GLOCK magazine is constructed from a hardened steel insert encased in high tech polymer to protect the magazine and prevent deformation, even when dropped from a great height. The high quality...$40.00 -
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 -
Out of stockOn Sale
LMT Defense - 6.8 SPC / .224 Valkyrie Enhanced AR15 Bolt - L7Q3C
LMT Defense
Now: $263.35Was: $289.00This is a new Lewis Machine & Tool 6.8 Special and .224 Valkyrie AR15 bolt. It features the same durable construction as LMT’s 5.56 Enhanced Bolt with an emphasis on reliability with use of...Now: $263.35Was: $289.00 -
Out of stockOn Sale
Knight's Armament - 7.62 QDC Open Brake Kit - 3/4"-24 TPI - #115992
Knights Armament Company
Now: $370.32Was: $389.81KAC- Knight's Armament 7.62 QDC OPEN BRAKE KIT, 3/4"-24 TPI (115992) The 7.62 QDC OPEN BRAKE KIT, 3/4"-24 TPI, developed for 7.62/6.5 platforms. It accepts KAC’s QDC line of sound suppressors,...Now: $370.32Was: $389.81 -
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