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while it should be legal I don't know of anyone who makes a brace to fit the Mossberg 590 action and I would be very cautious about making ANY modifications to the shockwave or the Remington version as they are such a grey area you could very well find yourself arrested and having to defend those legal mods in a court of law and hoping that the opinion of the jury/judge goes in your favor this article is a example even though he was found not guilty it still cost him thetruthaboutguns.com/2018/11/daniel-zimmerman/atf-suffers-rare-court-loss-in-ohio-short-barrel-rifle-prosecution/
Dylan, yes it is legal. Just keep a copy of the Braces' ATF Compliance Letter with you and you will be fine Sir. Cheers and Happy Holidays!