CONVERSION KIT FOR THE MK48 MACHINE GUNS TO 5.56X45 NATO. KIT INCLUDES BARREL ASSEMBLY, BOLT, SLIDE, OP-ROD, FEED COVER ASSEMBLY, FEED TRAY, TRIGGER FRAME WITH MK46 NICKEL BORON PARTS, MK46 MAIN DRIVE SPRING, HDD FOLDING MK46 CHARGING HANDLE ASSEMBLY AND 5.56 EJECTOR BLADE ASSEMBLY. THIS IS THE ONLY COMPLETE MK46 5.56 CONVERSION KIT ON THE MARKET, THE VERY BEST.  THESE RUN THE STANDARD M27 LINKS.