So much of the weight of any carbine is often found in the barrel, and this fact led to many consumers clamoring for an ultralight barrel for their 9mm carbines and AR pistols. Foxtrot Mike Products stepped up with its FM-9 9mm Ultralight Barrels.Each of Foxtrot Mike Products' FM-9 9mm Ultralight Barrels are machined from 41V50 chrome-moly vanadium steel and are finished to provide match-grade accuracy and precision, thanks to a button-rifling process that cuts a 1:10-inch twist rate designed to stabilized all 9mm projectiles.All-black finishFeatures 1/2-36 TPI threaded muzzleSalt bath nitrided QPQ/Melonite finishEach barrel is machined with 1/2-36 TPI muzzle threads, designed for compatibility with most of today's muzzle devices and suppressors. Foxtrot Mike Products FM-9 9mm Ultralight Barrels are built to work with all Colt- and Glock-style 9mm upper receivers and are machined with integrated feed ramps.