Description
.300 BLK Complete Upper Receiver (XTS-CU103FBK)
Our Complete Barreled Uppers are fully assembled in-house and ready to pin to your lower receiver. We use forged American-made receivers and US-made barrels—carefully selected for quality, reliability, and consistency. Every upper is assembled right here in Arlington, Texas.
The XTS-CU103FBK Complete Upper features our ADZ Rail in several different colors, or classic black, with mil-spec Type III Hard-Coat Anodizing.
Optional: Black Nitride M4-cut BCG.
See our 12″ ADZ Rail HERE.
The barrel crown on this upper stops short of the rail end. The flash cone provides enough added length to surpass the end of the rail.
Specs
- Caliber: .300 AAC Blackout
- Barrel Length: 10.5“
- Barrel Material: 4150V Chrome Moly Vanadium, QPQ finish
- Barrel Twist Rate: 1:8
- Feed Ramps: M4, NiB finish
- Muzzle Thread Pitch: 5/8×24
- Gas System: Pistol-length
- Journal Size: 0.750″
- Muzzle Device: MZ FS308M
- Handguard Length: 12″
- Charging handle: Mil-spec
Check out our blog for more info on parts compatibility, build help, assembly guides, and more!
The XTS ADZ Rail uses 6061-T6 aluminum and comes anodized in six colors. It features a full-length Picatinny top rail, M-LOK slots at 3, 6, and 9 o’clock, and QD sling sockets at both ends. A two-bolt clamping base locks it firmly to the barrel nut.
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