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23,190 Posts
You cancel the 2 out with what you are planning on. Yes, it is legal because that stuff only matters on a semi-auto. The problem I see though is going from say a 26" hunting barrel, to a reasonable 18.5" HD barrel, and adding a 7" bayonet...bringing it back up to 25.5". The short barrels are for maneuvering around tight corners and this would seem to cancel that out.