Hotter 9mm +P+ was the recipe back when the 40SW variant came out. I was still active duty, had the cash to do it and had one built, by Cylinder & Slide .... Great concept / idea but not really necessary as NDE inspection of both my BHP’s after thousands of rounds of +P+ loads and years of showed no damage .... many pro-con debates to be googled .....
Who can say....:o)
I’m curious what all they had to do. Was material added to the breech face and was the extractor and ejector modified or replaced? If you can find one Browning did make a Hi-Power that in my opinion was much better suited for the higher performance 9mm rounds. The MK II runs a 20 lb spring as apposed to the 17. I have 2, one is stock and the other has had a little tinkering done to it. Slipped in a Barstow barrel, removed the mag safety link and a little smoothing of the ramp and internals. Since the front sight is part of the slide I did not to mess with the rear sight which is smaller than most but I prefer that. I run everything through that pistol with no sign of stress or hiccups. Only ammo it doesn’t like is the 100 grain frangible but even Sig’s and Glocks don’t care for that.
Have you had any experience with the Smith & Wesson M&P line? I recently picked up an M&P 9L Pro C.O.R.E. with 5” bbl. It has the pre-milled slide to accept a red dot optical sight, e.g. Trijicon or Leupold, and the Performance Center trigger. I’d like to try the red dot but they cost almost as much as the gun. ;-) As with most guns, it shoots better than I do.