AR 9 build

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    Infidel11B

    Member
    Nov 3, 2018
    6
    Looking to build a AR 9. My question is regarding the barrel length. I want to put on a 8" barrel with collapsible stock. It will be a actual 9mm upper and lower.

    What issue or special hoops am I going to have to go through?

    Thanks in advance.
     
    teratos

    teratos

    My hair is amazing
    MDS Supporter
    Patriot Picket
    Jan 22, 2009
    59,828
    Bel Air
    Consider the CMMG Guard bolt barrel combo. Delayed blowback, so no heavy buffer/spring. I have a Colt pattern SBR with a 5” barrel I have set up with a 9 oz buffer and .308 Spring. It, of course, has a heavy 9mm BCG. I also have an 8” CMMG Guard barrel bolt in a RRA Upper with an 80% Glock lower. The bolt is almost identical to a standard AR BCG. It is much lighter as it uses a standard buffer/buffer spring. Less reciprocating mass = less felt recoil. Also less tinkering.
     
    dontpanic

    dontpanic

    Ultimate Member
    Jul 7, 2013
    6,635
    Timonium
    Infidel11B said:
    Looking to build a AR 9. My question is regarding the barrel length. I want to put on a 8" barrel with collapsible stock. It will be a actual 9mm upper and lower.

    What issue or special hoops am I going to have to go through?

    Thanks in advance.
    Click to expand...

    It will be an SBR so you will need a stamp. OAL must be >=29" when complete.

    If you use a collapsible brace instead, then you will have no OAL requirements and no tax stamp.
     
    4

    4guyz1stool

    Banned
    BANNED!!!
    Apr 16, 2017
    172
    Either make a pistol or an sbr with a 10inch or longer barrel. I think those are the only legal configurations.
     
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