Rebel Minis have posted images of the 3D sculpts for some 15mm sci-fi weapons they will soon be releasing.
From their website:
We are always working on new ideas from suggestions from our customers. We have had alot of requests for 15mm weapons sprues. John Bear Ross has taken up the challenge and created these weapons sprues. These can be used for customs, terrain and all kinds of things. These will be small, but really detailed.
John Ross’ website has more images of the sculpts and additional details about the weapons.