HDD MK48A1 LONGER BARREL ASSEMBLY, 7.62 NATO. HAMMER FORGED WITH 1in12 TWIST, CHROME LINED FOR LONGER MACHINE GUN OPERATION AND BARREL LIFE. FLUTED FOR BETTER HEAT DISPERSION AND LIGHTER WEIGHT. WE BUILD THESE WITH 5/8X24 MUZZLE THREADS FOR THE BEST RANGE OF MUZZLE DEVICES AND ACCESSORIES.  THIS BARREL IS 18.5" LONG AND WILL FIT THE FN MK48, HDD MK48, MK48L AND MGA SAW WEAPONRY.  HDD BARRELS INCLUDE THE CARRY HANDLE.  DUE TO HAMMER FORGING, CHROME LINING AND FLUTING THESE BARRELS ARE SUPERIOR FOR SUSTAINED FIRE AND LONGER LIFE. (10)