Props Thorssoli's M6G Pistol Build

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I've been experimenting with casting the pistols in flexible foam:
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So far I've only managed one decent looking pull (not pictured because my niece walked off with it). The rest all have significant voids or else the mold gave way under the pressure of the expanding foam and made a really bad parting line.

I think I've just about got the whole thing figured out, but I think the best option would be to make a complete new mold. The main problem is that the filling holes on the mold that I have end up leaving rough spots where the surface won't look good. I figure if I make a rigid mold that I can clamp shut after I pour the foam in, then it can expand to fill the void without having any sprue marks left behind.

Needless to say, it will probably be a while before I get around to making a rigid mold. In the meantime, the foam pistols that I've been able to make with the rubber mold are a bit of a pain to make and the finished product isn't really worth selling.
 
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