Gun Parts
Welcome to the Gun Parts superstore at Boss Firearms Company, LLC. Whether you are undertaking a custom precision build, performing routine armorer maintenance, or upgrading an existing platform, we stock the high-performance components you need. As an authorized dealer for premium OEM and aftermarket manufacturers, we provide everything from stripped receivers and match-grade triggers to enhanced bolt carrier groups (BCGs) and duty-ready barrels for rifles, handguns, and shotguns.
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LMT Defense - Rail Mounted M203 Receiver - L2B1
LMT Defense
$1,616.40The LMT Defense Rail Mounted M203 Receiver (L2B1) is a 40mm grenade launcher receiver engineered for mounting to any standard 1913 Picatinny rail. Unlike the classic barrel-mounted M203, the L2B1...$1,616.40 -
Out of stock
LMT Defense - Classic M203 Receiver - LMP300E
LMT Defense
MSRP: $1,525.00$1,413.90The LMT Defense Classic M203 Receiver (LMP300E) is a mil-spec 40mm under-barrel grenade launcher receiver designed for M16/M4 platform rifles. This Type 1 barrel-mounted receiver accepts standard...MSRP: $1,525.00$1,413.90 -
Out of stock
Heckler & Koch - MR762 M-LOK Handguard Black - 51000224
Heckler & Koch
$257.00German manufactured Heckler & Koch M-LOK handguard for the HK MR762. It is 14.7 inches in length, black finish, Aluminum construction, and has a flat top picatinny rail and M-LOK attachment points.$257.00 -
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 -
Out of stock
Sons of Liberty Gun Works - NOX Flash Hider 7.62mm/30 Caliber - #NOX-300
Sons of Liberty Gunworks
$115.00The Sons of Liberty Gun Works NOX series of muzzle devices blend the line between flash hider and compensator. They provide excellent flash suppression, muzzle climb reduction, and allow the quick...$115.00 -
On Sale
Sons of Liberty Gun Works - Blaster Guts Lower Parts Kit - BG-LT
Sons of Liberty Gunworks
MSRP: $120.00Now: $110.00Was: $120.00Lower Parts Kit made from only the highest quality Mil-Spec or better components. The SOLGW Bolt Catch and Safety Selector are a Mil-Spec AISI8620 investment casting per the USGI TDP. Their Safety...MSRP: $120.00Now: $110.00Was: $120.00 -
On Sale
Magpul MBUS Pro Flip Up Rear Sight
Magpul Industries
Now: $109.20Was: $114.95The Magpul MBUS Pro Flip-Up Rear Sight (MAG276-BLK) is Magpul's professional-grade steel flip-up back-up iron sight for AR-15/M4 rifles. Unlike the polymer MBUS, the MBUS Pro is machined from steel...Now: $109.20Was: $114.95 -
On Sale
Magpul - Adjustable AR15 CTR Stock - MAG310-BLK
Magpul Industries
MSRP: $64.95Now: $61.70Was: $64.95The Magpul CTR Adjustable Carbine Stock — Black (MAG310-BLK) is Magpul's improved mil-spec 6-position carbine stock for AR-15/M4 rifles. The CTR (Compact/Type Restricted) features Magpul's...MSRP: $64.95Now: $61.70Was: $64.95 -
Out of stockOn Sale
Magpul PMAG M3 20rd. .223/5.56mm AR15 Magazine
Magpul Industries
MSRP: $14.95Now: $14.20Was: $14.95The next-generation PMAG 20 AR/M4 GEN M3 is a 20-round 5.56x45 NATO (.223 Remington) polymer magazine for AR15/M4 compatible weapons. Along with expanded feature set and compatibility, the GEN M3...MSRP: $14.95Now: $14.20Was: $14.95 -
On Sale
Magpul PMAG Gen 2 MOE 30rd. .223/5.56mm AR15 Magazine
Magpul Industries
MSRP: $12.95Now: $12.30Was: $12.95The Magpul PMAG 30 AR/M4 GEN M2 MOE .223/5.56 Magazine — Black (MAG571-BLK) is Magpul's GEN M2 MOE 30-round PMAG for AR-15/M4 rifles. The GEN M2 MOE was the first major update to the original PMAG,...MSRP: $12.95Now: $12.30Was: $12.95 -
Radian Weapons - Raptor Ambidextrous AR15 Charging Handle - R0001
Radian Weapons
$104.95The Raptor™ is truly revolutionary in design & function. From rapid palm “blading” or finger thumb charges of the weapon, the motion is fluid & fast from either strong or support side. Made in the...$104.95 -
Proof Research Carbon Fiber Q The Fix Barrel (Choose options below)
Proof Research
$1,199.00Proof Research Carbon Fiber Q The Fix Barrel is a precision-machined carbon fiber replacement barrel designed specifically for Q (Q LLC) The Fix bolt-action rifle. The Fix is Q's innovative chassis...$1,199.00