My 223 & 6x45 bolt guns are threaded 1/2x28 and both wear ODL Titanium supressors that were intended to be used on AR15's. These to me are completely legal as they have been re-purposed. Same applies to some optics, if they are used on the currently "allowed" firearms then they are legal.
It has nothing to do with the farkn thread size ffs![]()
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