Construction: Part II and Initial Testing

I've measured out where the piston lands and cut a hole to allow a can to be side-loaded in the barrel. This also allows for some of the pressure to be drained out of the barrel when the piston reaches it's maximum travel, reducing wear on the cable/rubber band assembly and slightly decreasing time to reload. The top and bottom corners of the cut (top being towards launching end, bottom being towards reducing couplers) have been filed down so as to provide less of a sharp angle to snag the loosely moving piston.

This is a closeup of the loading hole:























And a shot of the entire test assembly:























Now some videos and pictures of the test! The can was launched on average around 15 feet at 70 PSI.