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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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 threading. Precision machined to FCD’s exacting...$85.50 -
Out of stock
Proof Research AR-Type Barrel 308 Win. 18" Rifle Length 100028
Proof Research
$1,149.00The Proof Research .308 Winchester 18” Rifle-Length Carbon Fiber AR-Type Barrel (100028) delivers match-grade precision from .308 Win and 7.62 NATO AR-10, DPMS-pattern, and SR-25 semi-automatic platforms in a dramatically lightweight carbon fiber...$1,149.00 -
KAC Knight's Armament SR-15 URX-6 Notched Handguard, 10.5" 122025
Knights Armament Company
$287.28The KAC Knight's Armament SR-15 URX-6 Notched Handguard 10.5" (KAC PN: 122025) is KAC's latest generation URX-6 free-float handguard designed for the SR-15 platform in a 10.5" length for CQB and SBR configurations. The URX-6 notched design features...$287.28 -
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 when installed on firearms with a shorter length of pull,...$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 the suppressor's QDC locking collar and provides critical...$215.46 -
Out of stock
KAC Knights Armament Company Shroud Suppressor 5.56 4" 118957-1
Knights Armament Company
$215.46The KAC Knight's Armament Shroud Suppressor 5.56 4" — Black (KAC PN: 118957-1) is Knight's Armament's thermal shroud for KAC CRS QDC 5.56mm suppressors in black. The shroud attaches to the suppressor's QDC locking collar for a secure, tool-free fit and...$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 Research’s world-class carbon fiber...$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 (FCD) uses elastic cord looped through M-LOK slots or...$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 mills a Glock slide for an RMR cut, this FCD plate...$10.00 -
FCD Forward Controls Design Gen 6 Glock RMR Plate OPF-G6
Forward Controls Design, Inc
$95.00The Forward Controls Design Gen 6 Glock RMR Optics Plate (OPF-G6) is FCD's precision-machined Gen 6 optics plate for mounting Trijicon RMR, Holosun 507/407, and compatible footprint red dot sights to Glock Gen 5 and compatible pistols. The OPF-G6 (Optic...$95.00 -
KAC Knights Armament SR-15 Stripped Ambi Lower Factory Blem 123689
Knights Armament Company
$749.00The KAC Knight's Armament SR-15 Stripped Ambidextrous Lower Receiver — Factory Blem (KAC PN: 123689) is a genuine Knight's Armament SR-15 ambidextrous stripped lower receiver, offered as a factory blemished unit at a significant savings compared to the...$749.00 -
VLTOR MUR-1A Modular Upper Receiver-KG Gun-Kote MUR-1A-KG-B
Vltor Weapon Systems
$242.96The VLTOR MUR-1A Modular Upper Receiver with KG Gun-Kote finish (MUR-1A-KG-B) provides the precision 7075 T6 aluminum MUR-1A upper receiver with a premium Cerakote/KG Gun-Kote finish for enhanced corrosion resistance and a durable, matte appearance. The...$242.96