Thanks. By cut slides i assume you mean the Gold Match. I think it's the only one with cut outs.
I have a TM M9A1 and I have been wondering, given the huge Beretta cut out in the slide, whether this might not last too long without cracking on green gas. Even on 144a.
I just wondered if, after a good few years of use, they also cracked on duster gas or equivalent.