Expanding foam vs. Straps - Also, where to DL simple rifle?

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First of in the pep links thread there's a link here to a simple version of the AR Rifle which I need to make in the next couple hours but it won't download. (try it) http://www.4shared.com/file/27111410/86eabf6b/AR_PEP.html
Can someone link me to a simple gun design that works?

Now, has anyone seen the kind of expanding foam car customizers use? It comes in a can, you mix in some hardener and it pours into whatever area you want and triples in size. Has anyone used this be used for fastening the arms and legs?
thanks, must've just been something screwed up with my browser at the time.

Ok, so anyone have thoughts on two part expanding polyurethane?
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