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I started a pump knex crossbow but I do not have the pieces to finish so I thought I would show someone who has the pieces my idea.

How it works
The pump is pulled and through a series of pulleys it brings the rubber band back. Once pump is completely pulled back it laches onto trigger and once the trigger is pulled it fires a bullet. I also had trouble with a mag so ill let someone build it and find a way to make a mag for it

Sorry I can't draw worth 2 cent
If you do build please give me credit for the design
<p>What a coincidence! I have never seen this mechanism before, and I just thought up the exact same thing right before I viewed this Instructable!</p><p>I may attempt to use this concept sometime in one of my K'NEX guns/crossbows.</p>
have you look at i_am_canadian's instructables
Thanks I wish I had the pieces to build it though
Good idea!

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Bio: Knex builder here at Instructables. I build Guns, and, Roller Coaster. I currently build about 2-3 guns a month. I strive to post quality as ... More »
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