Brandon printed one and put it to the test:

Definitely some kinks to work out in the design, but such awesome work so far.

6:57 – Putting the AK on the the lead sled is fine and all, but this is the part I was waiting for.

Thoughts?  Amazing how 3D printing has only been around for a handful of years and stuff that like that already be easily printed.  Imagine the capabilities another 10 years from now?