I'm building another coaxial, This ones gunna be real small and light. All I have to do is glue it together which I will probably finish tomorrow, It's about 50cm long with a PN18 40cm 25mm chamber, PN18 40cm 15mm barrel and 1/2 inch ball valve as the pilot. The piston is a 15mm coupler sanded a bit and filled with hot glue, It has a neoprene sealing face and some neoprene curled into a cylinder on the back as the bumper. The cap has an elbow tire valve off a wheelbarrow epoxied into it and inside has some stacked neoprene for the pistons bumper to hit. The C:B ratio is about 0.7:1 so should be quick to fill but still do some damage.
I'm also changing my old 50x15 piston gun, its ratio was 5.5:1 so it wasted a lot of air. I'm chopping it at the reducer and chucking a long 25mm barrel on instead, should be a lot quicker to pump and more efficient.
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Finished Just need to paint them, They both seal at low pressure and Ive shot them both at 20PSI so far
