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 - 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...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...MSRP: $42.50$39.42 -
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...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...$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,...MSRP: $108.00$100.35 -
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)...$230.33 -
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...$59.99 -
LMT Defense - 5.56 Lower Parts Kit Light (No Trigger Group) - R-LM556LPKL
LMT Defense
MSRP: $152.00$141.30The LMT Defense 5.56 Lower Parts Kit Light (R-LM556LPKL) provides all the mil-spec small parts needed to complete an AR-15 lower receiver build — minus the trigger group. This "light" version is...MSRP: $152.00$141.30 -
On Sale
LMT Defense - Ambidextrous Charging Handle Assembly - .308 - #R-LM308CB
LMT Defense
Now: $145.80Was: $150.30LMT Defense Ambidextrous .308 Charging Handle with Enhanced Tactical Latch. Utilizes dead stop latches to reduce tension on latch pins. A great cost effective upgrade for any SR-25 pattern modern...Now: $145.80Was: $150.30 -
Knight's Armament - Vertical Forward Pistol Grip - Black - 97098
Knights Armament Company
$83.73The Knight's Armament Company Vertical Forward Pistol Grip — Black (KAC PN: 97098) is KAC's mil-spec-quality vertical foregrip for MIL-STD-1913 Picatinny rail handguards. The KAC vertical grip...$83.73 -
Knight's Armament - Folding Micro Front Sight - 25654
Knights Armament Company
$174.24The Knight's Armament Folding Micro Front Sight (KAC PN: 25654) is KAC's precision folding front iron sight for SR-15, SR-25, and AR-15/M16 pattern rifles with MIL-STD-1913 Picatinny gas block rails...$174.24 -
LMT Defense - Semi-Auto Axle Trigger Group - LMP2400ES
LMT Defense
MSRP: $250.00$231.75The LMT Defense Semi-Auto AXLE Trigger Group (LMP2400ES) is one of the finest combat triggers in the firearms industry. The AXLE is a patented two-stage trigger system that blends the best features...MSRP: $250.00$231.75