Armin Ebinger from EBIARMS does not import to the US which is too bad, because he sure loves this country, just scared of our gun laws. But Pete deals with him and handles lots of US/UK exports and can help you out. Both have great customer service, but Pete is the hook-up. Tell him Tom Torres sent ya.
If the device actually works as a brake, and not a break, it will eventually pull right off the end of an unthreaded, smooth barrel, no matter how tight you think you've got it. Trust me on this. I have chased far too many muzzle brakes downrange that weren't installed using threads. Clamps, set screws (in machined dimples), silver solder. etc on rifles and pistols. After retrieving the brakes from downrange I had them and the barrels threaded for a much more secure installation.
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