Many rifles can be dry fired without any problem...the US army trained
with the M1 garand dry firing.
I have read that the most probable breakage would be the firing pin
tip....but I don't really understand why you would want to dry fire so
much....I do after a cleaning and reassembly maybe twice, then I run
a few snaps through the mag...and then off to the range.
Just don't do it 100 times a day.
It's like cleaning a rifle...people damage more guns by cleaning them
than firing them. Srubbing a rifle bore is not really necessary and can
actually hurt accuracy....A few passes with a good solvent and a few
dry patches, some FP10 in the action and in the bolt and that's about
good. I know friends who treat their guns like antique chinese vases...
it's a gun. Shoot it...if it breaks, send it to a GS and have it fixed....
Dry firing is ok a few times after a reassembly and cleaning and that
is all you need to do.