CONVERSION KIT FOR THE MK46 & MK46A1 MACHINE GUNS TO 7.62X51 NATO. KIT INCLUDES BARREL ASSEMBLY, BOLT, SLIDE, OP-ROD, FEED COVER ASSEMBLY, FEED TRAY, TRIGGER FRAME WITH MK48 NICKEL BORON PARTS, MK48 MAIN DRIVE SPRING, HDD FOLDING MK48 CHARGING HANDLE ASSEMBLY AND 7.62 EJECTOR BLADE ASSEMBLY. THIS IS THE ONLY COMPLETE MK48/7.62 CONVERSION KIT ON THE MARKET, THE VERY BEST. IF CONVERTING A HDD MK46 THEN NO MORE PARTS ARE NEEDED. IF CONVERTING A FN MK46 THEN YOU WILL NEED TO MODIFY THE BOLT RAILS, TRIGGER FRAME RECESS AND OPEN UP THE EJECTION PORT TO 7.62 SIZE. THESE RUN THE STANDARD M13 (M60/M240) LINKS.