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We're actually considering building a 20mm rifle, but that's going to be in the future when we feel like jumping through all the hoops that entails... We got the idea for the bottle openers while sitting around a campfire at Knob Creek (with a little refreshment involved...), and within about a week and a half of being back, we had the R&D accomplished, production jigs cut, and the dies turned on one of the lathes...
The brass is sourced from one vendor, and the steel projectiles from another. The brass just get neck sized, but the projectiles get chucked in a lathe for a cleanup, then turned around to make sure the base is uniform. Then they're machined five at a time in the Shizouka mill, cleaned up again in the Hardinge lathe, then seated, and given a final brushing and polishing before bluing.
Our Harding turret lathe is pretty cool, and I'm considering doing a run or three of solid copper projectiles, or maybe some other substance if someone is interested. Also considering maybe making some reduced-capacity brass...
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