Think: global file sharing of designs for servicable weapons, from pistols on up to ?, that can be printed at home. What you can print — from the materials to the size/quality of the object to the completeness (snap together construction) — is already moving forward quickly. The weapons effort will just be along for the ride.
“HaveBlue” has tested the first “printed” firearm and it works. Here’s his site, but it’s VERY slow. It didn’t blow up in his face.
Granted, he used an older professional grade Stratys 3D printer to do it. Printeres are much better now and handle many new materials.
Haveblue has been testing the “market” for distributing CAD/CAM weapons designs. His post of an earlier design to Thingverse (a site for 3D printing design patterns) led to a change in their policy (although it hasn’t been enforced).