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Thanks GBT.
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You're quite welcome.
Is it safe to assume that a "lightning link" or any other such device in a post-ban would not be legal for J. Q. Public?
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As others have pointed out, the Lightning Link, registered DIAS, or registered receiver are what are considered the NFA weapon, provided they were manufactured and registered before May 1986. You'll find people selling unregistered DIAS on gun auction sites and in Shotgun News, but as they were not registered and there is no way to prove their manufacture date, it is a felony to own one.
Since the Lightning Link and DIAS are parts, they can be put in any gun they are designed for, making them effectively NFA weapons while they are in them. So, you can buy a post-ban and put a DIAS of LL in it and it is effectively a Class III weapon, no longer subject to post-ban regulations, and can even be configured in a way that pre-bans cannot be without registration, as in the case of a sub 16" barrel. However, removal of the Lightning Link or DIAS from the weapon would be a no-no, even though some people do it. I've heard of people who travel with their Class III weapons who will remove the DIAS from the rifle while away from it. By the strict letter of the law, this is seemingly legal, by keeping the weapon (DIAS or Lighning Link) in your care at all times and illegal, as a post-ban with pre-ban features isn't kosher in it's own right and neither is full-auto fire control parts in a non-NFA weapon. Though, personally, if the gun were stolen, I think it would be in the ATF's best interest if the DIAS didn't fall into criminal hands. Someone, please correct me on this if I'm wrong.
With a registered reciver, that is the NFA weapon, and things are much less complicated.
You can find registered DIAS and Lighning Links, as well as SEAR packs for other guns that would make it perfectly legal to convert a post-ban or semi-auto gun to full auto.
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