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 - QD FLASH HIDER - 1/2"-28 - #93048
Knights Armament Company
MSRP: $120.06Now: $114.06Was: $120.06The KAC M4QD Flash Hider is an effective flash suppressor that also serves as a platform for attaching a Knight’s Armament quick detach QDSS-NT4 sound suppressor. Comes complete with a 7-piece shim kit. Specifications: Weight: 2.4oz...MSRP: $120.06Now: $114.06Was: $120.06 -
Out of stockOn Sale
Knights Armament - Piston Assembly - MK23 Silencer - M16X1 RH TPI - #94367
Knights Armament Company
MSRP: $774.00Now: $735.30Was: $774.00Replacement right hand piston assembly for KAC MK23 suppressorsMSRP: $774.00Now: $735.30Was: $774.00 -
Knights Armament - Piston Assembly - USP Tactical M16x1 LH - 22500
Knights Armament Company
$774.00The Knight's Armament Piston Assembly — USP Tactical M16x1 LH (KAC PN: 22500) is KAC's replacement piston assembly for Heckler & Koch USP Tactical pistols with M16x1 left-hand thread suppressor mounts. This piston component is part of the suppressor...$774.00 -
Out of stockOn Sale
LMT Defense - M203 Leaf Sight Handguard Mounted - 8448330
LMT Defense
Now: $175.50Was: $180.90Leaf Sight for Standard M203 Grenade Launcher. Mounts directly to the standard handguard.Now: $175.50Was: $180.90 -
Out of stockOn Sale
LMT Defense M203 Leaf Sight L2B/L2X Mounted
LMT Defense
Now: $243.90Was: $251.55LMT Defense Leaf sight developed exclusively for use with the LMT® rail mounted M203 launchers. This sight mounts via the rear rail screw of the launcher receiver.Now: $243.90Was: $251.55 -
Out of stockOn Sale
LMT Defense M203 Rifle Length Mounting Kit
LMT Defense
Now: $440.10Was: $461.70LMT Defense M203 Mounting hardware kit with leaf sight assembly. Mounts to standard M203 for a standard A2 rifle with 20″ barrel.Now: $440.10Was: $461.70 -
Out of stockOn Sale
LMT Defense M203 Carbine length Mounting Kit
LMT Defense
Now: $342.00Was: $352.35The LMT M203 Carbine Length Mounting Kit mounts to a standard M203 for a standard or M4 type carbine. Includes M203 mounting hardware and leaf sight assembly.Now: $342.00Was: $352.35 -
LMT Defense - M203 Quick Detach Mounting Bracket - C-12973116
LMT Defense
MSRP: $348.00$322.65The LMT Defense M203 Quick Detach Mounting Bracket (C-12973116) is a quick-detach mounting bracket for LMT M203 grenade launcher systems. This QD bracket enables faster installation and removal of the M203 from the host rifle without tools, providing...MSRP: $348.00$322.65 -
Out of stockOn Sale
LMT Defense - Short Rail Mount Pistol Grip Frame - L2X1PG
LMT Defense
Now: $823.50Was: $940.50LMT Defense Short Rail Mounted M203 Grenade Launcher Pistol Grip Frame. Does not include receiver or barrel. Allows for mounting of L2X launchers.Now: $823.50Was: $940.50 -
LMT Defense - Barrel Mount Complete Frame - L2H1PG
LMT Defense
MSRP: $1,329.00$1,232.10The LMT Defense Barrel Mount Complete Frame (L2H1PG) is the complete mounting frame for the LMT rail-mounted M203 grenade launcher system. This frame provides the structural mounting interface between the M203 receiver and Picatinny rail, including all...MSRP: $1,329.00$1,232.10 -
Out of stockOn Sale
LMT Defense - Short Rail Mount Complete Frame - L2X1S
LMT Defense
Now: $1,196.10Was: $1,232.10Short Rail Mounted M203 Grenade Launcher Complete Frame. Includes pistol grip and PDW buttstock. Does not include receiver or barrel. Allows for mounting of L2X launcherNow: $1,196.10Was: $1,232.10 -
Out of stock
LMT Defense - Full-Auto 5.56 Bolt Carrier - L7D3A
LMT Defense
$224.55The Lewis Machine and Tool AR-15 bolt carrier is a full auto rated, M16 cut carrier designed for long term durability and reliability. The manganese phosphate carrier is machined out of 8620 Carpenter steel and has been magnetic particle inspect to...$224.55