Here is a photo of a complete kit of parts for a UMT based Milestag gun. Apart from the 20mm barrel, all parts have been printed with RepRap. I'm quite pleased with the results. I'm able to manufacture parts that, once printed, can be assembled into a functional device within an hour or so. long live RepRap!
This kit, and its Milestag Core brother are now availabale at tagbits.co.uk
These parts come together to make this: