MK46 AND MK48 WELDMENT, HDD MIL SPEC CHARGING HANDLE GUIDE RAIL WITH THE LATER MODEL LIGHTENING CUTS. THIS RAIL FITS M249, MK46, MK46A1 AND MK48. HOLES FOR THE CHARGING HANDLE STOP ROLL PINS ARE PRE-DRILLED IN CORRECT POSITION. ALL MIL-SPEC CHARGING HANDLES FIT THIS RAIL WITHOUT MACHINING, BEST AVAILABLE.