I've recently come into possession of a Makerbot Replicator 2X 3D printer and am pursuing a number of projects. One is a drop in replacement FPS buffer for the WinGun/ASG Dan Wesson/G&G revolvers; first prototype below;
As you can see the prototype buffer is the red object inside the frame.
The goal is to create two different lengths of buffer to make these revolvers either "indoor" legal or "outdoor" legal.