Slide locks have been put on semi-auto pistols to keep them from cycling, the work by stoping the movement of the slide after the shot. Downside being that you have to push down on the lock and manually cycle the action again for every shot. Very very quiet but still not anything close to "movie" quiet.
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"Worthy is Freedom to only those who are prepared to stand behind their rifles and fight for their rights"
-Robert W. Hambley....A.K.A. Myself-
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