NEW 5 PART SET ... SET INCLUDES THE FOLLOWING...... RECEIVER LOCK IS F.N. HERSTAL BELGIUM MFG. FOR THE G1 RIFLE , " LOCK SPRING " , "SPRING PLUNGER" , "RECEIVER LOCK PIN" ' AND "LOCK LEVER SCREW" ......SET FITS ALL METRIC FAL'S.....SET CAN ALSO BE USED ON L1A1 INCH PATTERN RIFLES....EXCEPT YOU WILL NOT USE " RECEIVER LOCK PIN " ......SUPPLIED WITH THIS SET....THE L1A1 USES A SMALLER DIAMETER "NON RECESED" MIDDLE......IT USES A STRAIGHT PIN WITH OUT THE CENTER DIVOT / RECESS....UNFORTUNTLLY I DO NOT HAVE THE L1A1 PIN WHICH IS HARD TO FIND ....AS MOST GET MUCKED UP WHEN REMOVED.......THIS PIN CAN BE EASLY MADE USING CORRECT SIZE DRILL STOCK...