timelinex Posted October 12, 2021 Report Share Posted October 12, 2021 In reference to this thread, where I can't ask the question since it is closed: A few things were said that I did not understand and wanted to know the answer for curiosity's sake: Quote That colt replaced the original lower post 1986 with a new M4 lower. 1 person likes this Like this The original lower was sent to Colt for repair and came back an M4. 1. What makes this an M4 lower? I thought the only difference between m4 lowers and m16 lowers is literally just the marking. The marking on this lower is m16a1 still. Is there some difference between m4 and m16a1 lowers I do not know about? And if there is, did they then use the m4 lower buy stamped it "incorrectly" with m16a1 to keep it consistent with the lower that they were replacing? 2. Even more to the point....How could they have "replaced" an NFA lower and kept it legal? I thought that is why taking care of the MG part of guns is so crucial (like in an M60). You CANNOT replace the part that is the MG. It has to be "fixed" in any way possible, but if replacing , it is now considered a new MG and not allowed to be owned by civilians. What am I missing? Is that a newer rule that was added sometime post 1986 or something? Quote Link to comment Share on other sites More sharing options...
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