Quoted: I recently just bought my first AR. In the owners manual it tells how to perform a function check. Of course this is done with an emtpy chamber. It says to set the gun on safe and attempt to fire. The hammer should not fall. Then says to turn to fire and pull the trigger. The hammer should fall. In my experience with a variety of other guns, it is generally frowned upon to dry fire a firearm. Whats the deal with an AR?
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There is no problem dry firing as long as the rifle is fully assembled.
The military routinely uses dry firing with a dime balanced on the barrel as a training aid, and of course it is part of the function check.
It does not harm the weapon.
On the other hand, do not release a cocked hammer if the upper is off of the lower. The hammer striking the aluminum wall of the receiver will not help anything.