Receiver rail guide.

[sheepherder]

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???