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" Stripped Barrel Pistol Length Gas Chrome Lined 1:8 Twist Rate 5/8 X 24 Thread Pitch for Muzzle .300 Black Out Chamber .750 Gas Block Seat M4 Barrel Extension Mil-Spec Phosphate Coating Pistol Gas Weight: 1lb 4oz