AR15 5.56 Upper M4 Mag Phos 16"
Barrel Length: 16”Twist Rate: 1/7
Material: 4150 Chromoly
Gas Block: .750 Low profile
Thread Pitch: 1/2-28
Hand Guard: Rifle Length M-Lok
Never fired. No CH or BCG. Looking for other uppers 18" or 20" .223 wylde with 1:8 twist ONLY. Will also take 5.56 or .223 ammo in 62-77 grain ONLY. thanks!