BRN-601 20" Upper Receiver

Attachment Type: Direct Mount Item Weight (lbs): 4.320 Barrel Contour: Lightweight Cartridge: 5.56x45 NATO Barrel Length: 20.00 Kit: Full Gas System Length: Rifle Finish: Anodized Color: Gray Muzzle Device Diameter: 0.96 Item Height (Inches): 4.000 Hand: Right Gas Block Diameter: 0.625 Inches Quantity: 1 Make Model Fit: Brownells.BRN-601 Item Length (Inches): 31.000 Material: Aluminum Item Width (Inches): 2.000 Muzzle Threads: 1/2"x28 Model Number: BRN-601 Twist: 1-12 Receiver Style: Complete