NEW HDD MK48A1 BARREL ASSEMBLY IN 7.62X51 NATO, 16.5".  COMES WITH CARRY HANDLE. MUZZLE THREADS ARE 5/8X24 AND HAS 1in12 TWIST.  HARD CHROME LINED BORE AND CHAMBER, HAMMER FORGED, FLUTED UNDER HANDGUARD. (10) THIS BARREL WILL FIT ALL MODELS OF THE MK48.