- Billet Flat-Top Upper Receiver with M4 Feed Ramps and Forward Assist
- 16” Barrel (Chambered in 5.56 NATO, 1:8 Twist with 1 MOA Precision Guarantee)
- 4140 AE steel M4 barrel extension 1/2 x 28 threaded barrel
- Mid-Length Gas System with Low Profile Gas Block
- Unique-ARs Rook Muzzle Brake
Slim Hex Complete Upper
Your favorite Ultra-Light Hex design on a complete upper. When this item is backordered, please allow 3-4 weeks for production.