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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Out of stock
Heckler & Koch -P30L 9mm Tactical Barrel Threaded 13.5x1 LH - #229792
Heckler & Koch
$292.00Made in Germany at the HK factory from HK German Cold Hammer Forged barrel blanks, heat treated and finished to HK specs. This is the only HK factory manufactured P30L threaded barrel. The finest...$292.00 -
Heckler & Koch - SP5K/MP5 9mm 30rd Magazine - 206349S
Heckler & Koch
$85.99The Heckler & Koch SP5K/MP5 9mm 30-Round Magazine (HK PN: 206349S) is a genuine HK factory 30-round 9mm double-stack magazine for the SP5K, SP5, and MP5 platforms. The MP5/SP5K magazine uses H&K's...$85.99 -
Out of stockOn Sale
LMT Defense - 5.56/.223 MRP 14.5″ Barrel - #L7NA1B
LMT Defense
MSRP: $529.00Now: $476.99Was: $529.00This barrel is specifically engineered for the LMT monolithic receiver, featuring a low-profile gas block, carbine-length straight gas tube, and an A2 birdcage to minimize flash. It is coated and...MSRP: $529.00Now: $476.99Was: $529.00 -
Out of stockOn Sale
LMT Defense - AR-15 SPM10 Top End Full Auto BCG - #STE10F
LMT Defense
Now: $842.40Was: $1,049.00Complete top end includes: Standard flattop upper receiver 10.5" chrome lined 1:7†twist 5.56 barrel Full-auto bolt carrier group Tactical charging handle HandguardsNow: $842.40Was: $1,049.00 -
Out of stockOn Sale
LMT Defense - 5.56 Tactical Charging Handle Assembly AR15 - #LMP103
LMT Defense
Now: $67.68Was: $69.75This is a new Lewis Machine & Tool Tactical AR15 charging handle. It features LMT’s enhanced tactical latch mechanism that utilizes a dead stop latch to reduce tension on the latch pin.Now: $67.68Was: $69.75 -
Out of stock
Knight's Armament - M-LOK 3″ Rail Section (5 slot) - #31912
Knights Armament Company
$49.01This KAC M-LOK Accessory Rail is 3" in length and provides a 5-slot section of MIL-STD-1913 Picatinny rail for the addition of tactical accessories. Designed specifically for the URX 4 handguard,...$49.01 -
Out of stock
Knight's Armament - 5.56mm QDC MAMS Muzzle Brake Kit - #30168
Knights Armament Company
$356.33The KAC 5.56 MAMS (Multi-Axis Muzzle Stability) Brake has been engineered to increase controllability, to significantly reduce felt recoil, and to help mitigate a rifle’s flash signature as compared...$356.33 -
Out of stock
Knight's Armament - MWS M203 Leaf Sight - #22109
Knights Armament Company
$238.00Weight: 3.6oz (.10kg) Length: 4″ (10.16cm) Application: Top Rail Mounted Leaf Sight for the M203, 50-250 meters. NSN: 1010-01-522-0055$238.00 -
Out of stock
Knight's Armament - M-LOK QD Sling Mount - #32096
Knights Armament Company
$88.51The KAC M-LOK Sling Mount attaches quickly and securely to the URX 4 rail or any other rifle handguard that has a M-LOK interface. The sling mount is compatible with push button sling swivels (sold...$88.51 -
Out of stock
Knight's Armament - M-LOK Barrier Stop, Short - #113884
Knights Armament Company
$86.84Aggressive texture for increased traction and stability on most surfaces with integral QD socket.$86.84 -
Out of stock
Knight's Armament - M-LOK Scout Light Mount - #31906
Knights Armament Company
$65.34The KAC M-LOK mount for the SureFire M300 and M600 Scout Lights is a lightweight, direct-attach mounting platform. The mount can be positioned to place the light tight to the handguard at any...$65.34 -
Out of stock
Knight's Armament - MWS Rail Bipod Adapter w/ Stud - #98060
Knights Armament Company
$48.03Bipod adaptor that fits any MIL-STD 1913 rail. Designed for installation on the lower rail. Includes QD stud PN: 97030. Model: 98060 Color: Black Weight: 1 lb NSN: 1001-01-468-0350$48.03