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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On Sale
CETME LC 5.56 Parts Kit Intact Barrel OD Green w/ 2X 30rd Mags CETME-LC-PK
CETME
Now: $225.00Was: $250.00Now: $225.00Was: $250.00 -
Out of stock
KAC Knights Armament Company 7.62MM SR-25 K3 16" Upper Receiver Kit 121479
Knights Armament Company
$3,146.40The Knights Armament 7.62mm SR-25K3 16″ Upper Receiver Kit delivers elite M110K3 performance for custom AR-10 builds. Forged from aerospace-grade 7075-T6 aluminum with a Type III hardcoat black...$3,146.40 -
Revival Defense HUB-B Ti Lightweight Suppressor Adapter RD HUB-B Ti
Revival Defense
$109.00The RD HUB-B Ti is a lightweight, low-profile suppressor adapter from Revival Defense, machined from titanium to shave weight off the standard steel HUB-B while keeping the same 1.375x24 HUB thread...$109.00 -
Revival Defense Atlas 1.375x24 Suppressor Adapter RD HUB-B
Revival Defense
$79.00The Atlas-R is a 1.375x24, Bravo/"HUB" compatible suppressor adapter developed jointly by Revival Defense and Rearden MFG, built to accept Revival Defense's RF muzzle devices, Rearden devices, and...$79.00 -
Knights Armament Company SR-25 K6 16" 6.5 Creedmoor Upper Receiver Kit 116740
Knights Armament Company
$3,146.40Engineered for long-range precision in a compact platform, the KAC SR-25K6 6.5 Creedmoor Upper Receiver Kit combines superior ballistic coefficient, higher muzzle velocity, and reduced felt recoil...$3,146.40 -
Out of stock
Proof Research Carbon Fiber AR 15 Barrel 6mm ARC 18" 128671
Proof Research
$999.00Engineered for shooters who demand precision without the weight penalty, this 18" PROOF Research barrel pairs a 1:7.5 twist rate with a rifle-length gas system for smooth, reliable cycling across a...$999.00 -
LMT Defense Pistol Lower MIDMLK125-MARS-LOWER
LMT Defense
$899.00Pistol Lower from Exclusive 12.5" MARS-L Specwar Pistol MIDMLK125-MARSP The LMT Defense Pistol Lower is the full-featured$899.00 -
Benelli M4 5-Position Telescoping Stock 70132
Benelli
$230.00Upgrade your Benelli M4 tactical shotgun with the genuine OEM 5-Position Telescoping Stock Assembly, trusted by law enforcement and military end-users for its rugged reliability and adjustable fit...$230.00 -
Volquartsen Competition Bolt 2.0 for 10/22 VF10BLT
Volquartsen
$270.00Upgrade your Ruger 10/22 with the Volquartsen Complete CNC-Machined Bolt, precision-engineered for match-grade accuracy and reliability. This premium 10/22 bolt features a hardened, tuned extractor...$270.00 -
KAC Knights Armament Company SR-25 A3 6.5 CM 22" Upper Receiver 100223
Knights Armament Company
$3,283.20The KAC SR-25 A3 complete upper receiver is chambered in 6.5 Creedmoor and built for precision long-range shooting on the SR-25/AR-10 platform. It arrives complete and drop-in ready for compatible...$3,283.20 -
Out of stock
KAC Knights Armament Company SR-15 KS2 14.5" 5.56 NATO Upper 121436
Knights Armament Company
$1,800.00This is a new Knights Armament Company SR-15 KS2 14.5” complete upper receiver kit chambered in 5.56 NATO. This upper receiver features a 14.5” cold hammer forged, chrome lined, 1:7” rate of twist,...$1,800.00 -
Out of stock
KAC Knights Armament Company SR-25 KS7 14.5" 6.5 Creedmoor Upper 116741
Knights Armament Company
$3,312.00This is a new Knights Armament Company SR-25 KS7 14.5” complete upper receiver kit chambered in 6.5 Creedmoor. This upper receiver features a 14.5” cold hammer forged, dimpled hybrid barrel, medium...$3,312.00