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 stock
LMT Defense - 5.56 Enhanced Full-Auto Bolt Carrier Group - #R-L7Q3
LMT Defense
$553.50If LMT's standard bolt carrier group is the infantryman of the gun industry, then their enhanced BCG is the delta operator. This carrier group was designed to function effectively in full-auto, suppressed, and short barrel weapon systems, and it is...$553.50 -
LMT Defense - Tactical Adjustable Rear Sight - L8A
LMT Defense
MSRP: $250.00$231.75The LMT Defense Tactical Adjustable Rear Sight (L8A) is the quintessential fully adjustable rear sight for AR-15/M4 platforms — NSN: 1005-01-548-5193. The L8A utilizes the tried-and-true mechanism from the M16A2 carry handle rear sight, providing full...MSRP: $250.00$231.75 -
LMT Defense - Enhanced AR15 Trigger Guard - R-LMP109AE
LMT Defense
MSRP: $42.50$39.42The LMT Defense Enhanced AR15 Trigger Guard (R-LMP109AE) is a mil-spec aluminum trigger guard designed to give shooters extra finger clearance when operating in cold weather or with gloves. A direct drop-in replacement for any AR-15 or AR-10 build, this...MSRP: $42.50$39.42 -
Out of stock
LMT Defense - SOPMOD Buttstock - L7LA2BA
LMT Defense
MSRP: $228.00$211.50The LMT Defense SOPMOD Buttstock (L7LA2BA) is the preferred stock of USSOCOM (US Special Operations Command) soldiers — trusted by the world's most elite military units. This NSN-issued buttstock (NSN: 1005-99-288-7479) delivers the durability, comfort,...MSRP: $228.00$211.50 -
Proof Research - Carbon Fiber LMT MRP/MWS Conversion Barrels (Choose Options Below) (6mm 14.5" is Stainless Steel)
Proof Research
$1,100.00 - $1,375.00Proof Research Carbon Fiber LMT MRP/MWS Conversion Barrels (PROOF-BARRELS) are precision-engineered replacement barrel assemblies designed specifically for LMT (Lewis Machine & Tool) Modular Rail Platform (MRP) and Modular Weapon System (MWS) rifles...$1,100.00 - $1,375.00 -
LMT Defense - Ambidextrous AR15 5.56 Charging Handle - R-LMP103TA
LMT Defense
MSRP: $108.00$100.35The LMT Defense Ambidextrous 5.56 Charging Handle (R-LMP103TA) features enhanced tactical latches on both sides for true ambidextrous operation. Dead-stop latches reduce tension on latch pins, extending service life while allowing fast, positive...MSRP: $108.00$100.35 -
Out of stockOn Sale
Knight's Armament - MLOK QD Low Profile Mount - #113879
Knights Armament Company
Now: $69.13Was: $72.77Knights Armament QD socket mount to move sling rearward on the handguard while maintaining the lowest possible profile.Now: $69.13Was: $72.77 -
Knight's Armament - Folding M4 Front Sight - Taupe - 99051-TAU
Knights Armament Company
$230.33The Knight's Armament Folding M4 Front Sight — Taupe (KAC PN: 99051-TAU) is KAC's folding M4-pattern front sight in Taupe color for SR-15 and M4/AR-15 pattern rifles with fixed front sight base (FSB) or Picatinny gas block. The KAC folding front sight...$230.33 -
LMT Defense - Torque Wrench - R-LTW
LMT Defense
MSRP: $108.00$100.35The LMT Defense Torque Wrench (R-LTW) is a precision tool purpose-built for LMT MRP and MWS barrel systems. Pre-set to 140 inch-pounds, this torque wrench ensures proper installation of MRP and MWS barrel locking screws to manufacturer-specified torque...MSRP: $108.00$100.35 -
Heckler & Koch - MP5 Diopter Rear Sight Drum - 201542
Heckler & Koch
$59.99The Heckler & Koch MP5 Diopter Rear Sight Drum (HK PN: 201542) is the genuine HK factory diopter rear sight drum assembly for the MP5 and SP5 platforms. The HK drum diopter rear sight features four aperture positions (0, 1, 2, 3) that rotate to...$59.99 -
Out of stockOn Sale
LMT Defense - Buffer Tube Kit - .308 - #LM308BTK
LMT Defense
MSRP: $152.00Now: $136.80Was: $144.00The LM308BTK LMT Defense MWS Buffer Tube kit is perfect for those building a weapon on a budget or over time. Get what you need with out parts you dont. This kit is operation ready with our MWS, dry film lubed, buffer tube, recoil spring and H3 buffer...MSRP: $152.00Now: $136.80Was: $144.00 -
Out of stock
LMT Defense - 5.56 Receiver Extension - #LMP259A
LMT Defense
MSRP: $53.40$49.59Lewis Machine & Tool 5.56 receiver extension. Our milspec receiver extensions, or buffer tubes exceed the quality standards of others in the industry. We time our tubes to have a “no guess” fit with LMT lower receivers and follow up the...MSRP: $53.40$49.59