Kaiser US upper parts. Upper Receivers, BCG, Rails, Barrels, Muzzles, EPC. More than 60,000 Rounds Tested - Zero Failures

Upper Parts

Showing all 11 results

10.5″ Gunner 300BLK Pistol-Length 4150 QPQ Nitride

30 in stock / Shipping Available

The GUNNER (all caps, as it is that awesome) is the pinnacle of performance, weight, balance, and value.

$160.00 $160.00
14.5″ Gunner 5.56 NATO Mid-Length 4150 QPQ

30 in stock / Shipping Available

The GUNNER (all caps, as it is that awesome) is the pinnacle of performance, weight, balance, and value.

$165.00 $165.00
16″ Gunner 5.56 NATO Mid-Length 4150 QPQ

30 in stock / Shipping Available

The GUNNER (all caps, as it is that awesome) is the pinnacle of performance, weight, balance, and value.

$175.00 $175.00
18″ Heavy Fluted 6.5 GRENDEL Mid-Length 416-R Stainless QPQ Nitride 5R Np3 Extension

29 in stock / Shipping Available

The GUNNER (all caps, as it is that awesome) is the pinnacle of performance, weight, balance, and value.

$319.00 $319.00
Advanced Polymer AR-15 Rifle Matched Upper Lower Combo X-7 Fusion Pro Receiver Set V.2

Shipping Available

Kaiser’s proprietary polymer receiver sets are superior to aluminum in nearly every way. Injection molded from specially formulated virgin polymers enhanced with impact modifiers and both long and short-strand glass fibers for impact and shatter resistance.

Anti-Walk Trigger Pins now included in V.2

$469.00$511.00
New
Magpul BEV™ Block – AR15/M4

28 in stock / Shipping Available

The BEV Block (Barrel Extension Vise) is an all-in-one, compact vise block tool for AR15/M4 assembly operations of barrel nuts, flash hiders, etc.

$49.95 $49.95
MBUS Sight Set

30 in stock / Shipping Available

: MBUS sight set
: Color injection molded
: Spring-loaded flip up sight
: Impact resistant polymer
: Light weight and resists operational abuse
: Adjustment tool included
: Clamps to most any MIL-STD-1913 Picatinny/STANAG 4694 railed hand guard, but is specifically tailored to the AR15/M16 platform.

$105.00 $105.00
Ultra Light AR-15 Low Mass/Skeletonized Bolt Carrier Group (BCG) Indestructible KaiserUS TI-7

29 in stock / Shipping Available

We’re proud to present the premium Ultra Light AR-15 Low Mass/Skeletonized fully assembled bolt carrier group (BCG) with professionally staked military specified gas key, machined from upgraded 4130 hardened steel, skeletonized for lightness.

$249.00 $249.00
Ultra Light Titanium AR-15 Bolt Carrier Group (BCG) Indestructible Black Nitrate KaiserUS TI-7
New
Ultra Light Titanium AR-15 Bolt Carrier Group (BCG) Indestructible Black Nitrate KaiserUS TI-7

28 in stock / Shipping Available

Our custom titanium BLACK KNIGHT BCG with proprietary BLACK NITRATE coating lives up to that high standard of quality and performance.

$449.00 $449.00
X-7 BlackBird Eject Port Cover (EPC)

30 in stock / Shipping Available

X-7 BlackBird Eject Port Cover (EPC)

$42.00 $42.00
X-7 EPC Lightweight Durable Polymer

24 in stock / Shipping Available

X-7 Ejection Port Cover (EPC) Lightweight Durable Polymer

$14.50 $14.50