These are Crane Spec. MK12 barrels. These barrels are the result of tens of thousands of dollars in development done by the U.S. government to give our Special Operations guys the best weapon system they can have. We have spoken with many riflemen who have used these barrels and carried them in combat and have found unanimous satisfaction with their reliability and accuracy.
Material: 416R Stainless
Barrel extension: M4 feed ramps
Chamber: optimized for use with MK262 (Black Hills 77gr equivalent)
Twist: 1 in 7 right hand
Contour: for use with OPS inc.
Length: 18 in and threaded 1/2×28 for use with most common muzzle devices
Weight: 2 lbs 6.3 oz