they use a sear to release a pin into the blank if you use them on an access egress point you have to disarm everytime you pass trust me you forget they are there.
also the blanks are filled with a black powder substitute which is shit not very loud at all, your better off with a 9mm blank and adapting to fit, i used to empty the shot out of shells and even those were ok ish, you need the restriction of a barrel and shot to get the noise that a 12g normally produces.
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