Re: Light tuna gun
I once tried an enclosed muzzle, with a shape very similar to your capture guides, on the end of an open track hybrid tube. It was pretty much destroyed on the first shot. Examining it at the time, I thought that one of the metal crimps on the monofilament shooting line caught the top of the enclosed muzzle as the shaft exited.
I know it's not quite the same as your setup, but it seems like the same thing could possibly happen. It's probably a case of the divil being in the details, where similar looking constructions might work in one instance and not in another with only minor differences.
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