If it's riveted , I would first take the slide off . Try moving the rail while looking at the opposite side of the rivet , the tail . If the rivets are moving , you can try peening them with a hammer and punch . Smack the tail of the rivet withe punch , using a punch about the same size as the rivet .
If that doesn't work , you can drill the rivets out and get new ones . I would contact S&W and ask about them . If they don't have them try Numrich or other parts shops .
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