Hello! I'm just starting out on building parts and props for my own armor, and I was wondering if anyone knew of a good way to make a semi-working brute shot? I have the Pepakura files for a build, and am working on collecting enough materials, but I'd like some extra pizazz. I was wondering if anyone had a good reference for the actual grenades it launches so I could make some soft ones to load into the barrel and/or how to install a spring mechanism to launch them?