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 stockOn Sale
Knights Armament - 30mm Viper Picatinny Scope Cap - 113908
Knights Armament Company
Now: $189.28Was: $199.24Knights Armament picatinny rail scope cap allows for attaching accessory sighting systems. ÂNow: $189.28Was: $199.24 -
Out of stockOn Sale
Knights Armament - 34mm Scope Mount - 25284
Knights Armament Company
Now: $345.63Was: $363.83Knights Armament 34mm 1-Piece Scope Mount This KAC 34mm 1-Piece Scope Mount is constructed of lightweight aluminum and is compatible with any Picatinny-type top rail. Attaches via a pair of 1/2″...Now: $345.63Was: $363.83 -
Out of stockOn Sale
Knights Armament - 34mm Extended Eye Relief 1-Piece Scope Mount - 30025
Knights Armament Company
Now: $388.55Was: $409.00This KAC 34mm Extended Eye Relief 1-Piece Scope Mount is constructed of lightweight aluminum and is compatible with any Picatinny-type top rail. It is canted forward to allow for greater eye relief...Now: $388.55Was: $409.00 -
Out of stockOn Sale
Knights Armament - 30mm Scope Mount - 24755
Knights Armament Company
Now: $388.55Was: $409.00This KAC 30mm 1-Piece Scope Mount is constructed of lightweight aluminum and is compatible with any Picatinny-type top rail. It is the scope mount that was developed for use in the M110 SASS rifle...Now: $388.55Was: $409.00 -
Out of stockOn Sale
Knights Armament - Leupold Delta Point Pro Modular Scope Cap Attachment - 113911
Knights Armament Company
Now: $207.87Was: $218.81Allows attachment of optics with Leupold Delta Point Pro footprint to the Modular Scope Cap. ÂNow: $207.87Was: $218.81 -
Out of stockOn Sale
Knights Armament - Trijicon RMR Modular Scope Cap Attachment - 113909
Knights Armament Company
Now: $129.95Was: $136.79Allows attachment of optics with Trijicon RMR footprint to the Modular Scope Cap. ÂNow: $129.95Was: $136.79 -
Out of stockOn Sale
Knights Armament - Rear Sight Peep Aperture Insert 300 meter - 97081
Knights Armament Company
Now: $2.81Was: $2.96This KAC Aperture Sight Insert snaps into a 300 Meter Flip Up Rear Sight, constricting the peep aperture for a more precise sight picture. ÂNow: $2.81Was: $2.96 -
Knights Armament - Universal Bridge - 111793
Knights Armament Company
$968.81The Knight's Armament Universal Bridge (KAC PN: 111793) is KAC's low-profile Picatinny rail accessory bridge for mounting a secondary device over a KAC RAS or URX handguard. The Universal Bridge...$968.81 -
Out of stock
Spuhr - Trijicon RMR Interface - A-0010
Spuhr
$62.50Interface for attaching Trijicon RMR Type 1 and 2 and Trijicon SRO to an ISMS scope mount. Includes shim plate and screws. The A-0010 footprint also matches the following, though screw sizing may...$62.50 -
Out of stockOn Sale
Unity Tactical - Vertical Foregrip Black - MS-VFGB
Unity Tactical
Now: $24.00Was: $26.00The Unity Tactical VFG is the perfect size Vertical Fore Grip for M-LOK rails. Its 360 degree sloping sides provide increased grip ability from all angles. It excels when used as a hand stop, but...Now: $24.00Was: $26.00 -
Out of stockOn Sale
Unity Tactical - FAST Red Dot Mount 2.05" Black - FST-COGB
Unity Tactical
Now: $163.00Was: $179.00FAST is a series of optic mounts and platforms that provide end users with a quicker sight picture than standard height mounts. A 2.05" optical centerline height provides faster/easier reticle...Now: $163.00Was: $179.00 -
Out of stockOn Sale
Unity Tactical - Fast Offset Optic Mounting Plate 2.05" - FST-SOPR
Unity Tactical
Now: $35.00Was: $39.00The FAST Offset Optic Adapter Plates place mini red dot sights on the FAST Offset Optic Base. Each plate comes with a specific optic footprint and uses the optic manufacturer's hardware. Each plate...Now: $35.00Was: $39.00