just so we're all on the same page...the 'rails' are the ~1/16" x ~4" long protrusions on the sides of the receiver that run inside the grip frame...Under recoil, the receiver only travels about 3/8" using these rails...
If these are what you are referring to, I would like to see a pic...
If they are the two 'fins' sticking up on the abutment at the rear of the grip frame, that Vlim referred to...I would still like to see a pic...
How did you ever manage to break either of these two possibilities???
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I like my coffee the
way I like my women...
...Cold and bitter... 
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