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Since the lower is the machine gun can I put a modern upper on a class III M16?

Discussion in 'NFA Firearms and Accessories' started by specizripn, Jan 13, 2013.

  1. specizripn

    specizripn Member

    I am looking into purchasing a transferable M4 or M16 and I understand the purchasing process and cost already, but I was wandering about making a few changes. Isn't the lower receiver technically the machine gun, so couldn't I put a modern upper receiver on the gun legally? I like the modern ar style uppers with rail mounts better than the carrying handle sights on most of the pre86 guns. If so wouldn't I need the bolt carrier modified to an open bolt-carrier?
  2. shotgunjoel

    shotgunjoel Well-Known Member

    You are correct that the lower is the machine gun and that you can put on any upper that you please. The M16 doesn't use an open bolt design, but you would need an M16 bolt carrier in any new upper. I suppose that you could use the carrier from the current upper on the M16 and put it into any modern uppers that you buy.
  3. specizripn

    specizripn Member

    Thanks so much, thats exactly what I was looking for!
  4. jmorris

    jmorris Well-Known Member

    Will add even otherwise SBR uppers are OK without another stamp.
  5. AlexanderA

    AlexanderA Well-Known Member

    Regarding the bolt carriers, I would add that FA bolt carriers are legal even in semiautomatic guns (per a letter ruling from the ATF to Colt), and that in fact many new semi guns are sold with FA bolt carriers.

    The beauty of the AR-15/M16 design is that it's completely modular. If you have a registered FA lower (including a registered DIAS or LL), you can use any style, length, or caliber upper.
  6. specizripn

    specizripn Member

    Cool, thanks guys! You're all very helpful!
  7. Prince Yamato

    Prince Yamato Well-Known Member

    Actually there are open-bolt ARs. I forget which models. They exist though.
  8. Quiet

    Quiet Well-Known Member

    Colt/Diemaco M-16A2 LMG

    Made during the 1980s for the Canadian Army Squad Automatic Weapon trials. It lost out to the FN Minimi.
  9. CmdrSlander

    CmdrSlander Well-Known Member

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