My son and I shoot service rifle highpower and use AR15s. I started with a DCM M1, moved to an M1Aicon (semiauto M14 clone), and I also have a M1903 for Springfield and vintage rifle matches. I can't even begin to guess how many millions of dry fires I've put each through. We practice almost every day. No issues with any of these rifles. I also have a Kimber M84 in .308 for hunting. This Winchester M70 copy's owners manual not only allows dry firing, they recommend it for practice. I don't know about other milsurps but these I have experience with.