More 3D printed stuff used for airsoft and the latest is the Shotshells from Brain Exploder... "Third video in the series of taking this 500 fps WinGun CO2 revolver and taming it down to a usable velocity and at the same time adding more output per shot. These shells have now gone from concept to product and you can get yourself some.

With the latest evolution the shells are able to shoot 6 BBs per shot at about 200fps this makes them fairly accurate within 30-40 feet but as your range needs increase simply decrease the amount of BBs in each shell to extend the range and up the FPS."