Sounds like a familiar design.... mine was 405mm long and 2" dia, it is pretty heavy though, if I get my mits on another barrel I might try for some slots near the muzzle end, or maybe just fluted with ports at the bottom of the flutes. The only tricky bit with your idea is getting the crown sorted depending on how deep you counter bore it, maybe a brass rod that is a good fit for your hole with the end turned/filed/ground to the same angle as the drill bit and some valve grinding paste. Im not really convinced the baffles in mine do anything but I have a lot of relatively small ports
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