The barrel is one of the most critical components of your build. We only offer high quailty barrels so you can be confident that your rifle will be off to a good start with which ever barrel you decide on.Features: 16" Mid Length Barrel MIL-B-11595E CMV Chrome Lined 1/7 Twist Rate 1/2 X 28 Thread Pitch for Muzzle 5.56 Nato Chamber .750 Gas Block Seat M4 Feed Ramped Barrel Extension MilSpec Phosphate Coating Midlength GasA2 Front Sight Base Pinned Front Sight Post FSP Detent FSP Detent Spring Sling SwivelDelta Ring Assembly MilSpec Barrel Nut Delta Ring Weld Spring Snap Ring Weight: 2lb 4oz