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The slide are interchangeable but that has nothing to do with it, the holes on he dust cover of the 5.1 are where the rail part goes and it extends pas the front of the slide and the 2nd part goes on the front of that, putting a 4.3 slide will leave a space of about an inch between the strike front and the end of the slide
look at a pic of a 4.3 and a 5.1 and you will understand
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