M16 lower question

Discussion in 'NFA Firearms and Accessories' started by Colt107, Dec 19, 2021.

  1. Colt107

    Colt107 Member

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    Sorry if this has been posted before but Question, new SOT 2 here and am working on a test full auto AR. Just ordered a M16 stripped lower with the pocket cut and all. Is all I need for the “full auto” aspect just a full auto sear, drill the 3rd hole, then just full auto lower parts kit. Then obviously I’ll fill out the forms, but on the building side am I missing anything? Thanks for any help.
     
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  2. MachIVshooter
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    MachIVshooter Contributing Member

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    You need an M16 fire control group; hammer, trigger, disconnector, selector and auto sear, with pins and springs.

    M16 bolt carrier if you don't already have it.

    Probably an H2 or H3 buffer if its not a rifle buffer tube, cyclic rates get high and can cause malfunctions in shorter gas systems.

    Adjustable gas block if youre gonna run suppressed.

    Then, yes, the 3rd hole.

    On filing, It's form 2 (singular) notice of (NFA) firearms manufactured. You'll do no others unless you transfer it F3.
     
  3. Colt107

    Colt107 Member

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    I appreciate ya!
     
  4. Ryanxia

    Ryanxia Member

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    Standard carbine buffer on a 10.5" barrel has worked without issue in my experience so might be worth a try. Matrix Arms seems to be the most economical for AR-15 lowers that has the pocket already set correctly. Resistance Arms is another brand and I was recently told Spikes is now but I'm pretty sure my Crusader lowers from Spikes from a few years ago did not have the pocket already good to go.
    The New Frontier Armory 3rd hole jigs seem to be pretty good quality and last for several pieces.
    Have fun!
     
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  5. Colt107

    Colt107 Member

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    Then just double checking but on the sear hole I’m using a 1/8 (.125) drill bit. That sound correct? Just double checking over as I’d hate to ruin a lower this quick haha. I picked up a centurion lower.
     
  6. MistWolf

    MistWolf Member

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    Make sure your pocket dimensions are correct. I believe the side to side dimensions are different between the full auto and semi auto pockets.
     
  7. MachIVshooter
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    MachIVshooter Contributing Member

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    The forward portion is the same, but the M16 maintains that width all the way to the rear, no thinner offset cut except at the very bottom where the selector detent is.
     
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  8. Ryanxia

    Ryanxia Member

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    Correct.
     
  9. Colt107

    Colt107 Member

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    When it comes to the form 2, the last form requests for a marking varience or a 6a form. If im not importing and im just using another manufacturer lower with their info still on it, and mine lasered as well. Do i just skip over this or do i still request a varience? Little confused on ATF wording in their directions.
     
  10. MachIVshooter
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    MachIVshooter Contributing Member

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    You don't need a variance, just have to put your required info on it. You can use the existing S/N and caliber markings (assuming it has the latter), just add the name on your FFL and city & state.
     
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