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  1. #1

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    CMMG 22lr conversion kit questions

    Hey guys. I'm sure some of you have crossed this bridge a time or two... with respect to the CMMG conversion bolts and magazines that you can buy as a kit...
    how well do they work ?
    how dirty do they make your 5.56 upper ?
    does the lead build up too much in the barrel or gas block port ?
    is it a better idea to just build a dedicated .22lr upper ?

    I'm mainly looking to do more paper shooting drills and think that .22lr fire will be more welcomed by the neighbors than 5.56 fire...

    I'm after more real results than internet star reviews / commentary.

    Thanks in advance for your constructive input!

  2. #2
    On Target

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    I have one being delivered tomorrow so I'm interested to see what everyone's thoughts are as well.

    Sent from my SM-G950U using Tapatalk

  3. #3

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    Are you referring to the full dedicated 22 parts or the "shoot 22 out of a 223" adapter that only replaces the bcg? I'm guessing you are talking about the adapter. I have a dedicated 22 pistol build and an adapter in a full size rifle. They both work well although I haven't put the number of rounds though it one would with proper rifle drills. The insert was for a young one to get used to the rifle itself before switching out the bcg to upgrade. And the pistol is more of a novelty as it's got a 4" barrel and no buffer tube.

  4. #4
    -Global Mod-

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    I do not have one yet but after seeing number of threads on this, I made up my mind to get a dedicated upper.
    I do have a pile of Sig and Black Dog Mags.
    I keep putting it off though since a,have a Sig 522.
    I do not want to put a pile of dirty 22lr in my 223 upper.
    Last edited by 340six; August 21st, 2019 at 12:59 PM.

  5. #5
    tactical hangover

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    The BCG with chamber adapter is the best conversion next running a dedicated upper.. I have both.. it comes down to 1x7 twist is not the best for even 40gr bullets but 1x8 and 1x9 does OK.. dont expect MOA at 50 yards.. even with a dedicated upper.. but its more reasonable if you just want to get kids involved or inexperienced shooters to use a full size gun with less report.. get the chamber adapter.. be sure to check the orings for good seal.. also expect to clean the upper more, but at least lube it well..

  6. #6

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    So I bought the CMMG conversion kit a while back, but haven't used it, yet. I was mainly wondering how much junk is going to get thrown through my rifles since I think .22lr is pretty dirty. MOA accuracy isn't as important since I'm talking 10 to 15 yard paper target silhouette drills, loading, reloading, transition to sidearm, etc. I want more trigger pulls and cheaper than $0.25 each. I guess I'll run it this weekend and see how I like it. I guess I can always build a dedicate upper later.

  7. #7

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    I have the CMMG BCG Conversion kit and 3 mags... the only issue I had was with one magazine that needed a tab to be shaved down (actually part of the instructions included with the magazine). The BCG Functions perfectly... the end of it is a .223 casing so it fits in the chamber. It doesn't use your buffer or spring, but rather a set of springs on the BCG that do the job.

    Does leave some residue on your barrel and dirty up your AR... but if you don't mind cleaning it and have some "bore cleaner" laying around... its a great conversion kit. I have spitballed getting a dedicated upper for years... couldn't justify it when I already had the conversion kit. With the conversion kit TEEEEECHNICALLY you could even lose the Buffer tube, Buffer and Spring if you really want to spice up the build or wanted to build up a REALLY small .22LR pistol.

    I would even say if you have an old upper laying around you could just leave the CMMG bolt with it and bingo... dedicated upper... But the instructions specifically state "DO NOT LEAVE THE CONVERSION BCG IN THE FIREARM WHEN NOT IN USE" -- I am assuming because of corrosion possibilities from the ammo and contrasting metals.

    Bottom line... great conversion kit... shoots great... fun to shoot... fun for the whole family!

  8. #8

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    Quote Originally Posted by kingfhb View Post
    With the conversion kit TEEEEECHNICALLY you could even lose the Buffer tube, Buffer and Spring if you really want to spice up the build or wanted to build up a REALLY small .22LR pistol.
    pffft...why would anyone want to do that?

    Click image for larger version. 

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  9. #9
    Moving forward

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    I’ve got one and several mags. All works as designed and it’s plenty accurate for doing drills and plinking out to 50 yds. I’ve been using plated .22 and so far I’ve not had any issues when going back to .223.

    FYI Cddn runs the mags on sale for $9.99 sometimes.

  10. #10

    Gold Member

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    I have had the CMMG conversion kit for about six years. Had the original revision. Got it more as a convenience and a way to get cheap trigger time using my regular lower. Never have had a hiccup but I did also wear it out after many (many) rounds. Called CMMG and they sent me a whole new one free of charge last year. I was so pleased I ordered a ded 22lr upper from them at the same time. FAR more accurate and proper length, bore size, and twist. It wears a NV scope and suppressor. It is a hoot of a pest machine.

    As far as lead and crud, I canít help but think that is an exaggeration. I clean my guns. No big deal with any caliber. If you are too lax about that seems like more of a shooter problem to me.

    For comparison, I also have an expensive Compass Lake A2 for high power practice. Whole different league in terms of price, but honestly donít see much difference in accuracy. Wind calls are WAY more of a factor with that little bullet no matter what you do.

    Sent from my iPad using Tapatalk

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