UPDATE! I plan on making an entire series of silent guns! I have mad a sniper, shotgun, and I even found a way to make a silent machine gun! :D Be sure to look out for these guns!
This is a silent pistol I invented. It is also my first knex gun, true trigger. It also uses few pieces.
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This video is a review by Tombuckey. Thanks Tom! http://www.instructables.com/id/Review-of-quotcowscankillquot-silent-pistol/