Thread: Home Workshop Barrel Rifling

@Cordite please get rid of the fly on the bottom of your post, I almost smacked the laptop onto the floor

Or you could make a button from an Allen key, thd calculator for hexagin duagonals is here:

https://www.omnicalculator.com/math/hexagon

Such a button would need case hardening, but a BP barrel itself can be out of mild steel.