I've been starting work on a couple 15mm launcher projects but can't seem to find any specifications to help with design. The biggest thing I'm missing at the moment is the twist rate for the rifling. I could technically just use booleans from existing releases but would much rather have some more control over the geometry. Anyone have the specs?

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Tbh if I were you I'd make a projectile specific to the barrel you end up with using boolean cuts to eliminate the headache of recreating pre-existing stuff. Or you could always just use the existing screw on 15 barrels originally used on the pen15

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