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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LMT Defense - 12" Piston MRP 5.56mm Barrel Assembly - #R-L7MC1B
LMT Defense
$716.8512″ Piston Chrome Lined 5.56×45 (.223) 1:7″ RH twist barrel Designed for the LMT monolithic receiver, this barrel utilizes a piston operating rod and has an A2 birdcage for reduced flash. The barrel is coated and cryogenically treated...$716.85 -
Out of stockOn Sale
LMT Defense - .308 Lower Parts Kit Light - LM308ALPKL
LMT Defense
Now: $145.80Was: $333.00By popular demand, we’ve established a lower parts kit less the trigger group. While our two-stage trigger group is among the best on the market, we realize you may prefer drop-in trigger groups or various other brands out there. This...Now: $145.80Was: $333.00 -
Out of stockOn Sale
LMT Defense - DMR Buttstock - DMR308T
LMT Defense
Now: $391.50Was: $403.65LMT Defense designated Marksman Rifle buttstock. Designed for .308 caliber rifles with carbine extension tubes. The DMR stock has comb height and length of pull adjustments for fine tuning of the shooter experience. This is a must have stock for quickly...Now: $391.50Was: $403.65 -
Knights Armament - Barrel Extension Action Wrench - 30447
Knights Armament Company
MSRP: $101.35$96.28The Knight's Armament Barrel Extension Action Wrench (KAC PN: 30447) is KAC's purpose-designed action wrench for removing and installing barrel extensions on SR-15, SR-25, and other KAC platforms. This specialized tool is required for proper barrel...MSRP: $101.35$96.28 -
Knight Armament - 5.56 QDC 3-Prong Flash Suppressor Kit - 1/2"-28 TPI - 30555
Knights Armament Company
$129.96The Knight's Armament 5.56mm QDC 3-Prong Flash Suppressor Kit (KAC PN: 30555) is KAC's signature 3-prong flash eliminator for 5.56mm rifles with 1/2"-28 TPI muzzle threading. The KAC 3-Prong Flash Eliminator is an extremely effective flash suppressor...$129.96 -
VLTOR - 7-Position A5 Receiver Extenstion - RE-A5
Vltor Weapon Systems
$56.66The VLTOR RE-A5 7-Position A5 Receiver Extension is the buffer tube component of VLTOR's innovative A5 system, designed for use with VLTOR's A5 buffer and spring for improved cycling characteristics on AR-15 carbines. The 7-position design provides...$56.66 -
Out of stockOn Sale
LMT Defense - Rail Mount Complete Frame
LMT Defense
Now: $1,196.10Was: $1,232.10LMT Defense Rail Mounted M203 Grenade Launcher Complete Frame. Includes pistol grip and SOPMOD buttstock. Does not include receiver or barrel. Allows for mounting of L2B and L2D launchers.Now: $1,196.10Was: $1,232.10 -
LMT Defense - M203 BARREL 9” - LMP380
LMT Defense
MSRP: $598.00$554.40The LMT Defense M203 Barrel 9" (LMP380) is a 40mm grenade launcher barrel assembly — NSN: 1010-01-611-3461. This 9-inch M203 barrel is compatible with LMT's Classic M203 Receiver (LMP300E) and Rail Mounted M203 Receiver (L2B1). The 9" barrel is the...MSRP: $598.00$554.40 -
Out of stock
Knight's Armament - 4 Rib Rail Panel - Black - 97166
Knights Armament Company
$28.15The Knight's Armament 4-Rib Rail Panel — Black (KAC PN: 97166) is KAC's 4-rib polymer panel for covering unused Picatinny rail slots on KAC RAS and other quad-rail handguards. The 4-rib design covers four Picatinny slots in a single panel, providing...$28.15 -
Knight's Armament - 9 Rib Rail Panel - 97169
Knights Armament Company
$27.99The Knight's Armament 9-Rib Rail Panel (KAC PN: 97169) is KAC's extended 9-rib polymer rail panel for covering unused slots on KAC RAS Picatinny quad-rail handguards. The 9-rib panel covers a larger section of rail — approximately 9 Picatinny rail slots...$27.99 -
Out of stockOn Sale
Knight's Armament - Rail Mount Anti-Cant Device - #114294
Knights Armament Company
MSRP: $129.94Now: $123.44Was: $129.94The Knights Armament Company Rail Mounted Anti-Cant Device is a Picatinny rail-mounted bubble level lets you know if the rifle is canted while shooting. This is especially beneficial with long range shooting where a canted rifle can drastically change...MSRP: $129.94Now: $123.44Was: $129.94 -
Out of stockOn Sale
Knight's Armament - 6-Rib Picatinny Rail Panel - Black - #97168
Knights Armament Company
Now: $26.59Was: $27.99KAC's iconic Ribbed Rail Panels have seen use all over the globe on US military M4 Carbines. The lightweight polymer panels are ribbed for an enhanced grip, and help insulate the support hand from barrel heat. While originally designed for use on the KAC...Now: $26.59Was: $27.99