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No.
That's the whole point of a DIAS. It's "Drop in", meaning there are no mods to the lower.
"Not True," I hear you cry, "You may have to mill out the sear block!"
Yes, on some lowers you have to do that, but not on Mil-spec lowers (Bushy, etc).
Even if you mill out the sear block, that does not mean the lower is forever a machine gun. That does not "Count" in the eyes of ATF as making a machine gun. The mods that will get you time in jail are holes drilled in the side where a regular sear goes (just above the selector).
Don't you just love these laws?
So if you have a registered DIAS, you can put it in any AR you own. The AR is a machine gun only as long as the sear is in it. The advantage is that you can put it in multiple lowers, and if you ever damage a lower you can just switch it.
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