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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HK Heckler & Koch MR556A1 5.56 30rd Magazine 251770S
Heckler & Koch
$73.99The Heckler & Koch MR556A1 5.56mm 30-Round Magazine (HK PN: 251770S) is the genuine HK factory 30-round 5.56 NATO/.223 Remington magazine for the HK MR556A1 semi-automatic rifle. This steel-body,...$73.99 -
Out of stock
HK Heckler & Koch SP5K 9mm 15rd Magazine #215610S
Heckler & Koch
$83.99New Heckler & Koch SP5/SP5K 9mm 15-round magazine. Designed to match the same quality standards as HK’s legendary MP5 magazines, the SP5K 15‑round mag offers dependable function and reduced reload...$83.99 -
Out of stock
Masterpiece Arms DS9-TCS Hybrid- Medium Red Trigger
Masterpiece Arms
$3,599.00This is a new Masterpiece Arms DS9-TC chambered in 9mm featuring a 4.6" threaded bull barrel with single-port compensator, co-witness Trijicon medium red trigger, aluminum aggressive grip, and...$3,599.00 -
FCD Forward Controls Design 5.56 Bolt Catch Dimpled ABC/R v3 AA
Forward Controls Design, Inc
$58.90The Forward Controls Design ABC/R v3 Dimpled 5.56 Bolt Catch (ABC/R v3 AA) is the dimpled-texture (all-around/AA) variant of FCD's ABC/R v3 Augmented Bolt Catch for AR-15/M16 receivers. The...$58.90 -
Out of stock
FCD Forward Controls Design Ambidextrous Charging Handle LPVO #ACF-L
Forward Controls Design, Inc
$118.75 This is a new FCD (Forward Controls Design) Ambidextrous Charging Handle. ACF-L is an AR15/M16 ambidextrous charging handle based on our ACF. Whereas with the ACF, we kept the T handle nearly the...$118.75 -
Magpul Industries M-LOK Aluminum 3 Slot Rail Section MAG580-BLK
Magpul Industries
$18.00The Magpul M-LOK Aluminum Rail Section — 3 Slot (MAG580-BLK) is Magpul's precision-machined aluminum Picatinny rail section for M-LOK compatible handguards. The 3-slot rail section installs directly...$18.00 -
Dead Air Armament Key Mount Muzzle Brake 45 Caliber 5/8x24 DA161
Dead Air Armament
$75.00The Dead Air Key Mount Muzzle Brake (DA161) in .45 caliber with 5/8x24 thread pitch is a precision-machined muzzle device that combines functional recoil reduction with Dead Air's KeyMo quick-detach...$75.00 -
Dead Air Armament KeyMicro Flash Hider 5/8x24 9mm DA116
Dead Air Armament
$75.00The Dead Air KeyMicro Flash Hider (DA116) with 5/8x24 thread pitch is a compact muzzle device purpose-built for 9mm pistol-caliber carbines and suppressor hosts. Designed as the mounting adapter for...$75.00 -
Dead Air Armament Xeno Flash Hider 5/8x24 DA122
Dead Air Armament
$75.00The Dead Air Xeno Flash Hider (DA122) with 5/8x24 thread pitch is a precision-machined muzzle device designed as the foundation of Dead Air's Xeno suppressor mounting system. The Xeno Flash Hider...$75.00 -
Heckler & Koch Three Position Retractable Buttstock 227901
Heckler & Koch
$732.50The Heckler & Koch Three-Position Retractable Buttstock (HK PN: 227901) is HK's genuine factory three-position adjustable/retractable buttstock for HK416, MR556, MR762, and compatible AR-pattern...$732.50 -
HK Heckler & Koch Fixed Side Folding Stock for SP5's 261249
Heckler & Koch
$320.00The Heckler & Koch Fixed Side Folding Stock for SP5 (HK PN: 261249) is the genuine HK factory fixed-position side folding stock for the SP5 and SP5K 9mm semi-automatic platforms. This folding stock...$320.00 -
LanTac USA M-Spec Carbine Gas Tube 01-MSPEC-GT-CRBN
LanTac
$18.99This is a new LanTac USA LLC M-Spec Carbine Gas Tube. It fits AR 15 with carbing length- gas system, comes complete with gas tube roll pin, is laser engraved, and manufactured from 306 stainless...$18.99