silencer. by the way the gun is acting and the "jams", my guess is he's using a .22 with subsonic ammo, which typically fails to cycle the slide....but keeps it all nice and quiet with the supressor as well. he was obviously non shaken by the "jam" and ready to rack the slide as needed.  my guess.... probably a ruger as they are cheap, plentiful, reliable, and easily rigged. i mean, "in minecraft" i've used coke-bottle silencers with my ruger .22 just to see how quiet it actually gets.
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