Probably a really bad idea.
Of course we don't know exactly what the OP wants to use the inert training gun for. But if he intends to use it for some purpose that really does call for an inert training gun, like certain training or practice exercises, he should not be using a gun that can fire live ammunition.
Simple fix, for training in the classroom, REMOVE THE FIRING PIN. Now you have the real deal and no way possible for it to go off.
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