Description
5.56 NATO Complete Upper Receiver (CU-556-07FS)
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 CU-556-07FS features our black ADZ rail with our MZ-FSFH22S Muzzle Device, both using mil-spec Type III Hard-Coat Anodizing.
Optional: Black Nitride M4-cut BCG.
Due to the nature of the anodizing process, color shades may vary slightly between parts. Please read our full disclaimer before purchase.
Specs
- Caliber: 5.56x45mm NATO/.223 Remington
- Barrel Length: 7.5“
- Barrel Material: 4150V Chrome Moly Vanadium, QPQ finish
- Barrel Twist Rate: 1:7
- Feed Ramps: M4, NiB finish
- Muzzle Thread Pitch: 1/2×28
- Gas System: Pistol-length
- Journal Size: 0.750″
- Muzzle Device: MZ-FSFH22S
- 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.
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