Twin 7/32" Big Gun Cannon 2.0

This is the production version of the cannon that I am installing in my Mikasa. It has a number of improvements over the first version uploaded. The Magazine Breech layer and Piston layer have been merged into a single piece to improve reliability of the pistons, and holes have been added for 6mm magnets to improve feeding if desired. Rotation has been upgraded to use a press-fit ball bearing instead of a bronze bushing. All small threads for the valve and magazine have been converted to...