Just buy an older P95... the one with out the stippled grip.... the textured grip and railed frame are the new model that came out about 2 or 3 years ago... plenty of older P-95s out there....
personally I see no benefit to the rail... can't for the life of me think of why I would want to hang something off of it...
then again, you could get a newer model and just fill in the rail part...
here is a picture of both the new and old models.... because of parralex in the wide angle lens the newer model on the left looks a little shorter.... but isn't ...also I measured both and the rail does not add any thickness to the size of the foreframe>