The reason I asked is that when installing the ZRTS tapered barrel cone (it's aluminum, I expected steel) and SS guide rod, I noticed the merest mark on the breech of the barrel above the chamber. The gun came 'next-to-new' so it hasn't been fired much, live or dry.
I had to replace the ambi-safety (done under warranty by Blue Line, thank you!) as the previous owner had installed very nice rosewood grips that lacked the ambi relief cut. As a result, the non-steel ambi sprung at the joint. In so doing, the safety plunger took off for parts unknown! Not the first time I've done that, so I shoulda knowed better .... It ricocheted off something and actually landed in the pocket of my hoody! Last time that happened, I was on my hands and knees with a flashlight.
The plunger spring was overly stiff (more so than on my R1's or SR1911's) so I trimmed it back a few coils. Now installing the safety is much easier and it still 'snaps off' just fine.
Haven't put a round through it as yet, but I'm going to feed it Federal HV HP 36 gr and CCI MiniMag 40 gr HP, both copper washed. They should make it perk.