Using a real gun for this sort of practice would violate at least one of the 10 commandments for firearms.

There have been quite a few people who've been killed with "empty" guns. Don't take the chance. As a range officer, I've had at least three incidents where someone with an "empty" gun had an accidental discharge. Thankfully all were in a safe direction.

Guns have a funny way of reloading themselves. OBG, you tell 'em.
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The ultimate result of shielding men from the effects of folly is to fill the world with fools.
-- Herbert Spencer, English Philosopher (1820-1903)