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Half the barrels are clear PETG 9245K25 from McMaster, the 4 with the red stripe are polycarbonate of some kind that I had on hand, but the dimensions are the same.
The I.D. is about 0.500" +-0.005 compared to CPVC which is closer to 0.484.
Yep the barrel opposite of the firing barrel is where the index is. Its much easier to design than the clutch system, and great for manually operated turrets.
