questions reguarding "Good Iron M14 US Coast Guard" muzzle brake

I would take Smith Enterprises at their word. They are know for quality products. I've never had one of those USCG flash suppressors, but they look to be an excellent bolt on product. You should be able to simply reuse your M305 castle nut and mount it up. I know a USGI flash suppressor fits perfectly on on my Norinco's, using the Norinco castle nut of course.

Try dealing with them if you're Canadian lol
 
All these restrictions and delays create more opportunity for a home grown product. The American's have a distinct advantage in tooling up a shop for more volume.
 
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