I don't know how different an AR15 and an M16A2 actually are, but in the Marine Corps you dry fire your rifle thousands of times when you're snapping in (dry firing the rifle in various shooting positions checking your trigger control and getting used to the positions).
Perfectly OK to dryfire assembled; but if you dryfire the lower when it is separated from the upper, the hammer slams into the body of the lower and there have been reports of cracks from doing this.
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