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
LMT Defense - Front Pivot Pin - .308 - LM308A3
LMT Defense
$14.22The LMT Defense Front Pivot Pin for .308/AR-10 (LM308A3) is a precision-machined OEM replacement front pivot pin designed for LMT's large-frame .308/7.62x51mm MARS-H and MWS AR-10 lower receivers...$14.22 -
LMT Defense - Rear Takedown Pin - .308 - LM308A7
LMT Defense
$14.22The LMT Defense Rear Takedown Pin for .308/AR-10 (LM308A7) is a precision-machined replacement rear takedown pin designed specifically for LMT's MARS-H and MWS .308/7.62x51mm AR-10 platform lower...$14.22 -
VLTOR - A5 SPRING AND BUFFER KIT SP-A5
Vltor Weapon Systems
$107.96The VLTOR A5 Spring and Buffer Kit (SP-A5) provides the complete spring component for the VLTOR A5 buffer system — the longer, properly tensioned spring designed to work in concert with the VLTOR A5...$107.96 -
Out of stockOn Sale
Knight's Armament - URX Barrel Nut Wrench -
Knights Armament Company
Now: $117.18Was: $138.11Knights Armament proprietary barrel nut wrench used for installing or removing URX barrel nuts. Wrench should be used in conjunction with a 1/2″ torque wrench (not included). Recommended installation...Now: $117.18Was: $138.11 -
Volquartsen - Firefly Bolt 2.0 - Upgrade Your Ruger 10/22 - #VF10FY2
Volquartsen
MSRP: $170.00$161.00If you shoot subsonic 22 LR, the Firefly Bolt is a must-have. The Firefly Bolt upgrades your Ruger® 10/22® for optimal subsonic performance. This CNC-machined, Type III hard-anodized aluminum bolt is...MSRP: $170.00$161.00 -
Out of stockOn Sale
LMT Defense - Extension Tube - .308 - #LMP259C
LMT Defense
MSRP: $64.30Now: $57.87Was: $59.67LMT Defense .308 receiver extension tube. LMT offers its 308 receiver extension, or buffer tube, for sale to customers for their builds. This tube is approx. 3/4″ longer than a standard AR-15 style...MSRP: $64.30Now: $57.87Was: $59.67 -
Dead Air Armament - Ghost Piston 1/2 x 28 RH - Black Finish - DA401
Dead Air Armament
$89.00The Dead Air Armament Ghost Piston 1/2x28 RH — Black (DA401) is Dead Air's replacement/expansion piston for the Ghost pistol suppressor series with 1/2x28 RH barrel threading. Dead Air's piston...$89.00 -
LMT Defense - 5.56mm 16" Chrome Lined MRP Barrel Assembly - L7PA1B
LMT Defense
MSRP: $598.00$554.40The LMT Defense 16" Chrome Lined 5.56mm MRP Barrel Assembly (L7PA1B) is engineered specifically for LMT's Monolithic Rail Platform (MRP) upper receivers. This 16-inch, 5.56×45 (.223) barrel features...MSRP: $598.00$554.40 -
Forward Controls Design - Reinforced Buffer Retainer - For AR Systems - RBF
Forward Controls Design, Inc
MSRP: $8.00$7.60The Forward Controls Design Reinforced Buffer Retainer (RBF) is FCD's upgraded replacement for the factory AR-15 buffer retainer. The standard mil-spec buffer retainer is a known weak point in the...MSRP: $8.00$7.60 -
LMT Defense - SOPMOD-Mini 5.56 Buttstock Kit - PDW-KIT
LMT Defense
$560.50The LMT Defense SOPMOD-Mini 5.56 PDW Buttstock Kit (PDW-KIT) is a complete Personal Defense Weapon conversion kit for any mil-spec AR-15. This kit reduces overall weapon length by 2.75 inches...$560.50 -
On Sale
Magpul PMAG M3 30rd .223/5.56mm AR15 Magazine
Magpul Industries
MSRP: $14.95Now: $14.20Was: $14.95The Magpul PMAG 30 AR/M4 GEN M3 .223/5.56 Magazine — Black (MAG557-BLK) is Magpul's industry-standard 30-round GEN M3 PMAG for AR-15/M4 rifles in black. The GEN M3 PMAG is the gold standard for AR-15...MSRP: $14.95Now: $14.20Was: $14.95 -
Proof Research Carbon Fiber Q The Fix Barrel (Choose options below)
Proof Research
$1,199.00Proof Research Carbon Fiber Q The Fix Barrel is a precision-machined carbon fiber replacement barrel designed specifically for Q (Q LLC) The Fix bolt-action rifle. The Fix is Q's innovative chassis...$1,199.00