NEW HDD MK48A1 BARREL ASSEMBLY IN 6.5 CREEDMOOR, 16.5". HARD CHROMED, HAMMER FORGED, FLUTED UNDER HANDGUARD, SERVICABLE GAS BLOCK. NEW PICATINNY RAIL GAS BLOCK WITH FOLDING FRONT SIGHT FOR SUPERIOR OPTICS USE. THIS BARREL IS ALL YOU NEED TO CONVERT A MK48 OR MK48A1 MACHINE GUN TO 6.5 CM. COMES WITH CARRY HANDLE. MUZZLE THREADS ARE 5/8X24 AND HAS A 1in8 TWIST.  (10)