1. This site uses cookies. By continuing to use this site, you are agreeing to our use of cookies. Learn More.

Dedicated .22LR AR Build

Discussion in 'Rifle Country' started by WinThePennant, Mar 9, 2013.

  1. WinThePennant

    WinThePennant Well-Known Member

    Does anyone know of a good website that shows in great detail how to build a .22 LR AR?

    I've built a few ARs in 5.56, but a 22 LR build is a bit different. Mostly the same, I'm sure, but different enough that I want to read up on some reference materials.

    Are, if you have built a 22LR AR, then by all means post your experiences here.

    I recently purchased an ATI polymer lower. I'm not big on polymer lowers for 5.56, but I think it will do nicely for a .22LR build.

  2. tuj

    tuj Well-Known Member

    1) Build the lower as you normally would.
    2) Buy a 22lr upper.
    3) Shoot!
  3. Anmut

    Anmut Well-Known Member

    ^^ this!

    Or buy a CMMG conversion kit - cheaper and just as fun!
  4. Bentley4700

    Bentley4700 Well-Known Member

    The conversions are fun, but don't expect any great accuracy. A .22lr bullet going through a 1:7-1:9 barrel just isn't going to do well. The dedicated uppers are 1:16 twist.
  5. WinThePennant

    WinThePennant Well-Known Member

    I didn't think .22 LR ARs needed a buffer....
  6. tuj

    tuj Well-Known Member

  7. rskent

    rskent Well-Known Member

    Pretty easy.
    They go together pretty much like any other AR. I used a CMMG bolt carrier and barrel.
    Its not crazy accurate with bulk ammo, but its good enough for offhand practice.

    As for reliability.
    A spacer behind the buffer spring helps keep the bolt carrier seated against the barrel.
    I used a piece of round plastic about two inches long, free from the junk box.
    I ended up with a mil spec trigger group with a home spun trigger job. I couldn’t get
    reliable ignition with either a Giselle or Jewell trigger. Since they are blow back if the
    round doesn’t go off extraction pretty much sucks. With the mill spec trigger it is very
    reliable. Like I said, Its good enough for off hand practice.
  8. tuj

    tuj Well-Known Member

    I too could not make my CMMG upper work with my Geiselle national match trigger; never captured the hammer correctly during blowback. I experimented with springs, etc.

    So yes, use a mil-spec trigger. Also I never got the BHOA kit to work reliability either, so I'd just skip that part.
  9. WinThePennant

    WinThePennant Well-Known Member

    What is a "BHOA kit?"
  10. tuj

    tuj Well-Known Member

    bolt hold open actuator kit. The CMMG mags with the green followers I believe are the only ones that work with this, but in theory, you adjust the BHOA kit and the mag will lock the 22 bolt back with the actual bolt release as opposed to it interrupting the forward return of the bolt via the follower.

    You don't really need the BHOA kit because the follower of any of the 22lr mags will ride up after the last shot and hold the bolt partially open.

Share This Page