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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FCD Forward Controls Design Castle Nut A5 CN5F FDE
Forward Controls Design, Inc
$32.30The Forward Controls Design Castle Nut A5 — CN5F FDE (CN5F-FDE) is FCD's precision-machined A5/VLTOR-compatible castle nut for AR-15 receiver extensions, finished in FDE (Flat Dark Earth). The CN5F...$32.30 -
FCD Forward Controls Design Rail Cover, Picatinny 1.7" RCP1.7
Forward Controls Design, Inc
$11.40The Forward Controls Design Picatinny Rail Cover 1.7" (RCP1.7) is FCD's short-length Picatinny rail cover for protecting unused MIL-STD-1913 Picatinny rail slots on AR-15 uppers, handguards, and...$11.40 -
FCD Forward Controls Design Rail Cover, Picatinny 3.3"RCP3.3
Forward Controls Design, Inc
$15.20The Forward Controls Design Picatinny Rail Cover 3.3" (RCP3.3) is FCD's medium-length Picatinny rail cover for protecting unused sections of MIL-STD-1913 Picatinny rail. The RCP (Rail Cover,...$15.20 -
FCD Forward Controls Design Rail Cover, Picatinny 4.07" RCP4.07
Forward Controls Design, Inc
$17.10The Forward Controls Design Picatinny Rail Cover 4.07" (RCP4.07) is FCD's full-length Picatinny rail cover for protecting unused MIL-STD-1913 Picatinny rail sections on AR-15 uppers, handguards, and...$17.10 -
Out of stock
FCD Forward Controls Design Rail Cover Picatinny 6.43" #RCP6.43
Forward Controls Design, Inc
$19.95RCP (Rail Cover, Picatinny) is a 1913 / Picatinny rails panel with the AA (All Angles), or dimpled texture. We use the dimpled surface on applications where it makes sense: bolt catches, magazine...$19.95 -
Magpul Industries M-LOK Aluminum 5 Slot Rail Section MAG581-BLK
Magpul Industries
$19.90The Magpul M-LOK Aluminum Rail Section — 5 Slot (MAG581-BLK) is Magpul's precision-machined aluminum Picatinny rail section for M-LOK compatible handguards, providing five (5) MIL-STD-1913 Picatinny...$19.90 -
Benelli M4 EXT Collapsible Stock 12ga 18.5" Semi-Auto Shotgun
Benelli
$2,166.67The Benelli M4 EXT 12‑gauge is a rugged, duty‑ready tactical shotgun built around Benelli’s proven ARGO® dual‑piston gas system for dependable semi‑automatic operation. It sports an 18.5" tactical...$2,166.67 -
Out of stock
Ruger Mark IV Barreled Upper Receiver 4.5" Threaded w/ Rail Blued SCU-0119
Ruger
$49.99This is a factory new unfired Ruger Mark IV 4.5” barreled receiver chambered for .22 LR. This upper comes with adjustable sights, unfinished picatinny optic mounting rail instailed, and a 4.5" bull...$49.99 -
Out of stock
Colt M-16 Lower Parts Kit - Full Auto
Colt
$199.99Includes: M-16 Fire Control Group Fire Control Group Pins and Springs M-16 Sear Sear Spring Sear Pin Bolt Catch Assembly Mag Catch Assembly Front Pivot Pin Rear Takedown Pin (2) Takedown Pin...$199.99 -
Out of stock
Colt 11.5" Upper FSP w/ Daniel Defense Omega 2.0 Rail, Bootleg Inc BCG - (Police Trade-In)
Colt
$650.00Features: Make: Colt Model: 6933 Caliber: 5.56x45mm Barrel Length: 11.5" Condition: Pre-Owned (Police Trade-In). Disclaimer: This Colt Uppers include a complete BCG made by Bootleg Inc which is the...$650.00 -
Out of stock
Colt 11.5" Upper FSP w/ Daniel Defense Omega 2.0 Rail - (Police Trade-In)
Colt
$650.00Features: Make: Colt Model: 6933 Caliber: 5.56x45mm Barrel Length: 11.5" Condition: Pre-Owned (Police Trade-In). Disclaimer: All uppers include a factory Colt complete BCG with a C marked bolt...$650.00 -
Out of stock
Colt LE6946CK 10.5" Complete Upper - Police Trade-In
Colt
$850.00Features: Make: Colt Model: LE6946CK Caliber: 5.56x45mm Barrel Length: 10.5" Condition: Pre-Owned (Police Trade-In). Disclaimer: All uppers include a factory Colt complete BCG with a C marked bolt...$850.00