Haven’t altered my handgun for the most part, but will be changing to lightpipe sights on both my glock 21 and my ruger p89.
I do have a 1911 based race gun and its pretty much altered everywhere - ported, muzzle break, red dot, modified recoil spring, modified trigger, flared mag well, custom grips, the works. But it’s a RACE gun, not a carry gun.
Modified my 20ga shotgun, ported for muzzle break and recoil pad so that it’s easier to shoot and it doesn’t hurt… but it’s not going to ever be my EDC.