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, 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.