I just ordered a new guide rod for my G23 as it seems the original is getting weak. Well, the new one is nice and stiff, but, the captive piece on the end seems like it is ready to fall off. I can almost pull it off with my fingers. When I lock the slide back I can wiggle it back and forth. It seems like it will fly off when I fire the gun. Is this normal? IMO, I have a defective part.