Our armorer said he was darkening the peened spots so that I could better see if the problem continued after the new RSA. It did, but the burrs he polished off haven’t returned. Since I really started paying attention to this gun a few years ago I’ve primarily shot fairly light recoiling reloads, which feel about like standard 9mm loads. I wish I had kept track of how many rounds have gone through this old gun, but I didn’t. If I had to guess, I’d say at most, 3,000 rounds total. I wonder how many more it will handle?
Well, I finally had the trigger bar/firing pin engagement fall below acceptable spec in my G27 ... at somewhere around 12-14K rounds. It's seen a few thousand more rounds since then (and some parts replacement to restore engagement).
I've normally used whatever duty 180gr & 165gr duty loads were being issued in my G27, and haven't really seen the need to use the harder recoiling 135-155gr loads.
My first G26, on the other hand, even though having been fed a diet of duty ammunition that's included a lot of +P and P+ loads, still has plenty of engagement at the same round count/use as my G27. The .40's can experience a little more wear and tear, due to the increased recoil forces of the .40 S&W.