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 - Adjustable AR15 CTR Stock - MAG310-BLK
Magpul Industries
MSRP: $64.95Now: $61.70Was: $64.95The Magpul CTR Adjustable Carbine Stock — Black (MAG310-BLK) is Magpul's improved mil-spec 6-position carbine stock for AR-15/M4 rifles. The CTR (Compact/Type Restricted) features Magpul's...MSRP: $64.95Now: $61.70Was: $64.95 -
Knights Armament Company 7.62MM SR-25A2 20" Upper Receiver Kit 121471
Knights Armament Company
$3,283.20The Knights Armament SR-25A2 20" Upper Receiver Kit brings genuine military heritage to the civilian AR-10 platform. As the commercial counterpart to the M110A2 — the U.S. military's semi-automatic...$3,283.20 -
Volquartsen Competition Bolt 2.0 for 10/22 VF10BLT
Volquartsen
$270.00Upgrade your Ruger 10/22 with the Volquartsen Complete CNC-Machined Bolt, precision-engineered for match-grade accuracy and reliability. This premium 10/22 bolt features a hardened, tuned extractor...$270.00 -
Proof Research AR-Style Barrel 308 Win. 16" 1:10" Twist 5/8-24 Carbon Fiber Wrapped 101261
Proof Research
MSRP: $1,149.00$999.00Upgrade your AR-10 platform with the pinnacle of barrel technology: the Proof Research AR-Style .308 Winchester 16" Carbon Fiber Barrel (Part 101261). Designed for tactical shooters, hunters, and...MSRP: $1,149.00$999.00 -
J P Enterprises AR15 6.5 Grendel/ 6mm ARC Complete Bolt Assembly JPBC-EB6.5G
JP Enterprises
$155.75The JP Enterprises AR-15 6.5 Grendel / 6mm ARC Complete Bolt Assembly Enhanced (JPBC-EB6.5G) is a precision-machined, enhanced bolt assembly built from SAE 9310 nickel-chromium-molybdenum steel — the...$155.75 -
Proof Research CZ 455/457 .22LR 18.5" Threaded Barrel 121443
Proof Research
$825.00The Proof Research .22 LR 18.5” Threaded Barrel (121443) brings Proof Research’s legendary aerospace-grade carbon fiber barrel construction to the .22 LR rimfire platform. This prefit carbon fiber...$825.00 -
FCD Forward Controls Design 3 Prong Flash Suppressor 5/8x24 3P10
Forward Controls Design, Inc
$85.50The FCD Forward Controls Design 3-Prong Flash Suppressor 5/8x24 (3P10) is a compact, purpose-built 3-prong flash hider designed for .308/7.62x51mm and larger caliber rifles with 5/8x24 TPI muzzle...$85.50 -
Die Free Company Kung Fu Rifle Grip AR-15/AR-10 KFG-BLK
Die Free Co
$18.00Designed for AR15/M4 and AR10/SR25 platforms, the Kung Fu Grip has a reduced angle providing a natural fighting posture when firing from modern standing and prone positions. It improves comfort...$18.00 -
KAC Knights Armament Company Shroud Suppressor 5.56 4" FDE 118957-1-FDE
Knights Armament Company
$215.46The KAC Knight's Armament Shroud Suppressor 5.56 4" — FDE (KAC PN: 118957-1-FDE) is Knight's Armament's thermal shroud for KAC CRS QDC 5.56mm suppressors in Flat Dark Earth. The shroud attaches to...$215.46 -
Proof Research 16" Carbon Fiber 223 Wylde Barrel 1:8- 5/8-24 143254
Proof Research
$1,149.00The Proof Research 16” .223 Wylde Carbon Fiber AR-15 Barrel (143254) combines the versatility of the .223 Wylde chamber — which accepts both .223 Remington and 5.56 NATO ammunition — with Proof...$1,149.00 -
FCD Forward Controls Design Sling Keep A - Elastic Cord SlingKeepA
Forward Controls Design, Inc
$3.00The Forward Controls Design Sling Keep A — Elastic Cord (SlingKeepA) is FCD's elastic cord sling retainer for keeping your sling under control and out of the way when not deployed. The Sling Keep A...$3.00 -
FCD Forward Controls Design Battlewerxs RMR Sealing Plate BattlewerxsRMR
Forward Controls Design, Inc
$10.00The Forward Controls Design Battlewerx RMR Sealing Plate (BattlewerxsRMR) is FCD's precision-machined RMR optic sealing/mounting plate designed for Battlewerx-milled Glock slides. When Battlewerx...$10.00