Well it depends what you want: K'nex Slingshot (VERY powerful, sniper) (most powerful slingshot on the site):www.instructables.com/id/SR_V2/ Regular Slingshot (not k'nex)www.instructables.com/id/How-to-make-a-Country-Boy-style-slingshot/
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Do you want a sling or catapult !
Are you looking to make a single barrel or a double barreled sling shot?
There are a few options around the site...