Copper plated 22LR ammo for CMMG AR conversion kit?

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  • KYtoMD

    Member
    Mar 23, 2017
    59
    MD
    I am planning to get a CMMG 22LR conversion kit for my 1:9 .223 Wylde chambered AR.

    I've heard about issues with gas port fouling after shooting a lot of 22LR through a 223 barrel. Would using copper-plated ammo like CCI Velocitor or Aguila Superextra avoid this issue?
     

    photoracer

    Competition Shooter
    Oct 22, 2010
    3,318
    West Virginia
    Not really. I shoot competition and at one time I used a CMMG conversion in an AR. I only use copper-plated (actually copper washed not plated) CCI AR-Tactical in my rimfire competition rifles and that rifle eventually ended up with a completely fouled gas port in the barrel. Only real option is to install a dedicated AR .22LR barrel, which I did. Benefit is the .22 AR barrel has the proper 1:16 twist needed for 40g .22LR ammo.
    Otherwise I suggest breaking the conversion kit rifle down at regular intervals to clean the port or shooting 1-5 cleaning rounds of .223 thru the gun after every 500 rounds of rimfire.
     

    molonlabe

    Ultimate Member
    May 7, 2005
    2,760
    Mountaineer Country, WV
    Otherwise I suggest breaking the conversion kit rifle down at regular intervals to clean the port or shooting 1-5 cleaning rounds of .223 thru the gun after every 500 rounds of rimfire.

    I used to use my AR with a Cierner conversion during a youth fest in Wisconsin. The illuminated optics when set at 600 yards it would be on at 25 yards. The kids loved knocking down the iron targets with it. After I fired several cleaning rounds through it. Never had a problem.
     

    CodeWarrior1241

    Active Member
    Sep 23, 2013
    827
    Lutherville
    Is a 223 round considered to be "cleaning" in the sense that the gas blows through all the built-up 22lr crud in the gas port? Or is this something special?

    Sent from my SHIELD Tablet K1 using Tapatalk
     

    Melnic

    Ultimate Member
    MDS Supporter
    Dec 27, 2012
    15,257
    HoCo
    Not really. I shoot competition and at one time I used a CMMG conversion in an AR. I only use copper-plated (actually copper washed not plated) CCI AR-Tactical in my rimfire competition rifles and that rifle eventually ended up with a completely fouled gas port in the barrel. Only real option is to install a dedicated AR .22LR barrel, which I did. Benefit is the .22 AR barrel has the proper 1:16 twist needed for 40g .22LR ammo.
    Otherwise I suggest breaking the conversion kit rifle down at regular intervals to clean the port or shooting 1-5 cleaning rounds of .223 thru the gun after every 500 rounds of rimfire.

    How did you clean the gas port up once it was fowled?
     

    photoracer

    Competition Shooter
    Oct 22, 2010
    3,318
    West Virginia
    You need to pull your gas block back off the barrel hole and run a wire or pin thru it to unclog the barrel port (and push the crud out the barrel with a patch or brush). Then use a flexible but stiff wire and run that thru the gas block after you remove the gas tube from it and put it back over the barrel hole.
    Ask me how I know about this.:o
     

    John from MD

    American Patriot
    MDS Supporter
    May 12, 2005
    22,641
    Socialist State of Maryland
    I have been using a .22 conversion since I got it from Jon Ciener for an A1 M16. I have never had to pull the gas block off you clean one of my rifles. I shoot .223 in between the times I shoot .22 LR and that cleans it out just fine. Some lead does accumulate on the bolt tail and the back of the BCG. The bolt can be cleaned on a wire wheel or with a wire brush, the BCG gets cleaned with the BCG cleaning tool.

    Copper plated bullets are cleaner than the un coated but the only one I would stay away from are Remington Golden Bullets as they seem dirtier than most.
     

    lazarus

    Ultimate Member
    Jun 23, 2015
    13,658
    I have been using a .22 conversion since I got it from Jon Ciener for an A1 M16. I have never had to pull the gas block off you clean one of my rifles. I shoot .223 in between the times I shoot .22 LR and that cleans it out just fine. Some lead does accumulate on the bolt tail and the back of the BCG. The bolt can be cleaned on a wire wheel or with a wire brush, the BCG gets cleaned with the BCG cleaning tool.

    Copper plated bullets are cleaner than the un coated but the only one I would stay away from are Remington Golden Bullets as they seem dirtier than most.

    Golden bullets always leave little flecks of copper in my rimfires. Not handfuls, but they seem to be the only ones that do it. So I don't stock them.
     

    Schipperke

    Ultimate Member
    MDS Supporter
    Feb 19, 2013
    18,434
    We shot 600 rds CCI Mini Mags through the conversion bolt kit. Three months later put back the AR bolt and fired 50 rds, never a hiccup.
     

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