Back again! Here is a set (and sold individually) of MP Autobot hand guns! They were designed to fit both the MP-12 Lambo and MP-17 Datsun molds. They are available via my shapeways store if your interested in buying one (or a set). Thanks for looking!
updated with pics of the printed parts. I am going to have to make some slight mods so they fit the lambo brothers, but I think they turned out great!