The mission is simple, strive to build the highest quality products and offer them at the best possible price to the consumer. It doesnt matter if you are simply a gun enthusiast, a competitive 3 gun shooter or a military or law enforcement professional, Spikes rifles will serve you well and wont let you down when it counts and Spikes guarantee it. The barrel is one of the most critical components of your build. Spikes only offer high quality barrels so you can be confident that your rifle will be off to a good start with which ever barrel you decide on.Features :1/7 Twist Rate1/2 X 28 Thread Pitch for Muzzle5.56 NATO Chamber.750 Gas Block SeatM4 Feed Ramped Barrel ExtensionBlack Nitride Inside and Out