Review: CMMG AR-15 .22 Conversion Kit

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  • esrice

    Certified Regular Guy
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    Jan 16, 2008
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    Indy
    This topic comes up quite a bit these days, so I thought I would share my experience with my new AR-15 .22 conversion kit from CMMG.

    My Father, lovemywoods, has had a Ceiner kit for about 2 years now. Up until now, that has been my only exposure to these conversions. It runs well, but it came with a really crappy 10rd magazine. It was quickly replaced with Black Dog Mags, but he's had issues with broken feed lips (smoke polymer).

    With the cost of 5.56/.223 hitting $.40+ these days, these conversions are easily justifiable with a little math. The cost of the CMMG kit with 1 magazine and a 550 pack of .22s is about $205. That equals about 512 rounds of .223. Therefore, the kit pays for itself in ammo cost savings in the first 500 rounds. Pretty sweet!

    When I started looking for a kit, I knew Cwood at Indiana Supply Depot had the best price going. I realize that I pay Indiana sales tax this way, but to me its worth the few extra bucks to support a local guy that also supports INGO with his advertising dollars.

    I got home today to find a nicely packaged box on my front porch. Here is what was inside!

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    I got the kit plus 3 magazines. Here is a closer shot of the kit itself.

    28k6ijn.jpg


    Taking the items out of the plastic, here is what you're left with.

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    First impressions are good. The machining on the bolt looks well done, and the finish is nice and slick. Manually working the action is smooth, and there are no hiccups or burrs present. Everything locks up nice and clicks into place.

    The magazines are actually what impressed me most. When looking at pictures of them online, they looked lightweight to me, like they were hollow mostly inside, and probably not very tough. I was very wrong. They've really got some nice heft to them, and the polymer seems really beefy. The feedlips look strong, so I hope they aren't prone to the same failures that some Black Dog Mags have been.

    For anyone considering one of these, the question always comes up "Ok, just how easy is this to install/convert?"

    I'll show you!

    Step 1: Unload your weapon.
    348kitz.jpg


    Step 2: Push out pin and rock open the upper.
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    Step 3: Slide out your 5.56 bolt carrier group.
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    Step 4: With charging handle half way out, slide in your new conversion.
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    Step 5: Make sure conversion seats flush properly. Don't force anything.
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    Step 6: Close the two halves and push pin into place.
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    Step 7: Insert magazine and have some cheap fun!
    2na5oxh.jpg


    All of this can be done in 30 seconds, at the range, without any tools. Changing back to 5.56 is just the same in reverse.

    Here is what the conversion looks like completely installed.

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    I hope this gives everyone an idea of what these offer, and how they work. I will be sure to post a range report when I get a chance to see what kind of .22s this conversion likes to eat.

    Happy shooting! :ingo:

    ************UPDATE*******************

    Range Report added: https://www.indianagunowners.com/fo..._conversions-_cmmg_and_ceiner.html#post617864
     
    Last edited:

    snorko

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    Apr 3, 2008
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    Evansville, IN
    Nice "pre-range" review. I look forward to hearing how she shoots. I just realized that this combined with the standard 1 in 9 twist of an AR barrel means the Aguila SSS 60 grain rounds would stabilize...now for the suppressor.
     

    r6vr6

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    Jan 28, 2009
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    Nice "pre-range" review. I look forward to hearing how she shoots. I just realized that this combined with the standard 1 in 9 twist of an AR barrel means the Aguila SSS 60 grain rounds would stabilize...now for the suppressor.


    I just ordered some of the 60gr to try out in my CMMG kit. I hope it can cycle the action.
     

    WabashMX5

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    Aug 12, 2009
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    Brownsburg
    I just ordered some of the 60gr to try out in my CMMG kit. I hope it can cycle the action.

    Tagged to see your results. I've always thought that would be a great way to practice. Heck, a .22LR AR would be a kick-butt Appleseed rifle, especially if the 60-gr would be reliable enough to use its increased accuracy....
     

    Cwood

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    May 30, 2008
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    NE Ohio
    Evan,

    I have some Aguila SSS 60gr that I will bring with me this weekend and we will see how it performs.

    Make sure you bring your rifle!
     

    techres

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    Mar 14, 2008
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    Could you please get some 5 round groups so we can see the accuracy of these kits? I have debated getting one of these but have wondered what kind of MOA they can hold given a .223 barrel.

    I am very, very curious!
     

    papakevin

    Plinker
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    May 15, 2010
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    Southern Indiana
    I got one of the stainless conversion kits and I've only had one FTF out of about 800 rounds, and that was the ammo. Tons of fun. Only issue I had was questionable accuracy when I tried to use at an Appleseed, but still did OK (no rifleman score, but still not bad). Like the fact that it uses the same mags as the Sig 522, which my wife owns.

    I went with the stainless because I saw some reviews which showed the black coating coming off the standard models which concerned me. Plus, the stainless just looks "pretty".

    Interested in any suggestions on cleaning out the gas port/tube after firing. I believe changing it back to a .223/5.56 and shooting a couple shots will do the trick, however the club I belong to does not allow these rounds to be fired on site. Open to any good suggestions, as it is a blast to shoot.
     

    esrice

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    Interested in any suggestions on cleaning out the gas port/tube after firing. I believe changing it back to a .223/5.56 and shooting a couple shots will do the trick, however the club I belong to does not allow these rounds to be fired on site. Open to any good suggestions, as it is a blast to shoot.

    I'd be hesitant to stick anything down the gas tube/port. I would just shoot a few rounds of 5.56 when I had the opportunity. Its not like a dirty gas tube is going to affect your conversion kit anyway.
     
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