For something that size, I would go with a brush on mold. Rebound 25 is pretty good. You can also use Mold Max 30, like pitchforknumb said, and thicken it up with Thi-Vex.
Because there aren't enough Fallout 10mm pistols out there already... The first real project I'll be attempting is a replica of my current in game Mighty Powerful 10mm.
Hey,
I've continually found my way here on different occasions, so I figured it was about time sign up. I haven't really done any prop making although I've been interested in it for a while now. I do have some years experience with molding and casting so I'm not going in completely blind.