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Here is the Barrel Are Chamber assembly.
Notice that the 2" barrel stops 3" short of the 4" compression chamber not the end of the clean out(not shown here) this diminutions came from the design of the first piston assm that I had to change. It works well with the new design piston. I recommend that the piston be able to move back from the barrel the same distance that the barrel is round.(ex. with a 2" barrel the piston should move back 2" to allow max. airflow into the barrel.) Take into account that the piston will move into the clean out till it hits the "bumper" inside when figuring piston movement.
You must remove the stopping ridge in the bell reducer to slide the pipe through.
I do not recommend putting a potato stop in the 2" barrel . An air leak here would be very hard to fix and there is a small possibility that it could cause the gun to fire unexpectedly.
Spud Gun Improvements to Pneumatic Gun
Spud Gun Theory of Operation
Spud Gun How Much Does IT Cost
Spud Gun Barrel Adapter Assm
Spud Gun Barrel Air Chamber Assm
Spud Gun Air Control Assm
Spud Gun Air Gauge Assm.
Spud Gun Drilling of Clean Out Cap
Spud Gun Handle Assm. with Electronics
Spud Gun Handle Assm
Spud Gun Piston Stopper Assm
Spud Gun Wiring Digram