Includes a ready-to-install 1:24 twist chromoly barrel with an 11/16-24 threaded muzzle.
Bolt head includes the gas rings, extractor and ejector. Does not include bolt carrier, firing pin, etc. Standard right hand ejecting.
18″ barrels have a mid-length gas system and 16″ barrels have a carbine length gas system.
Lightweight barrels have a .750″ gas block journal. Mid-Weight barrels have an .875″ gas block journal.
18″ Light-weight barrel weighs 1.61 pounds.
16″ Light-weight barrel weighs 1.51 pounds.
16″ Mid-weight barrel weighs 1.97 pounds.