.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  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 $57.00 EXTRA.

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

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

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.