.300 BLK Complete Upper Receiver – XTSCU8300OR 

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 XTSCU8300 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. THIS UPPER DOES NOT COME WITH A BCG. ONE MAY BE ADDED FOR $100.00 EXTRA.

Due to the nature of the anodizing process, color shades may vary slightly between parts. Please read our full disclaimer before purchase.

See our 7″ ADZ Rail HERE.

Specifications:

• Caliber: .300 AAC Blackout
• Barrel Length: 8“
• 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: A2 Flash Hider
• Handguard Length: 7″
• 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.