Smoke. 2726 posts · Joined 2009. #3 · Jun 11, 2020. I don't know about the M16 to AR15 but I have quite a few AK full auto parts & as long as I don't drill the third hole in the receiver it is completely legal for me to own the extra parts, because the parts can not be used in my gun. When you buy a build kit made from a full auto gun, it ... More @Wikipedia
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