Hi, I just picked up a GSG 522 (re-designed). I know the cosmetic changes to the 522 included : open front sight, picatinny rail, etc. My question pertains to the picatinny rail.....mine DOES NOT have one. For those that DOES have one, is it "molded" on there or is it simply mounted on with a claw mount which might have just fallen off mine somehow? Thanks.