You might be interested. The other day we used the gun as a pile driver and pounded a SCREW into a 2x4 it took two shots to put most of it into the board.
We've made 2 new projectiles, pictures to come later. We've also added a grip frame from a paintball gun and wired the switch in so there is a trigger on the gun. I painted it black the other day, so it looks a little less "ghetto"