dedicated 22LR upper with CMMG AR conversion

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  • Melnic

    Ultimate Member
    MDS Supporter
    Dec 27, 2012
    15,282
    HoCo
    OK,
    What kind of barrel would I need here.
    I have one of these CMMG conversion kits.
    https://www.cabelas.com/catalog/pro...OQ%3D%3D&key=f3adac3ef5b445258fabc1d26e31bba6

    I want a barrel more suited to shooting 22LR through.
    I noticed the 22LR dedicated barrels look different than a regular AR barrel and am questioning that if I get a dedicated barrel, it will work with the conversion kit.

    Here is a barrel on the CMMG website
    https://cmmginc.com/product/barrel-sub-assm-16-1-ht-4140cm-sbn-22lr/

    I already have a stripped Upper as well as a spare handguard, muzzle brake & Charging handle, so all I think I need is the barrel.
     

    PowPow

    Where's the beef?
    Nov 22, 2012
    4,712
    Howard County
    I have that same CMMG conversion kit. My 10/22 takedown with BX trigger and BX-25 mags shoots better. I'm interested to see what folks come up with though.
     

    Melnic

    Ultimate Member
    MDS Supporter
    Dec 27, 2012
    15,282
    HoCo
    I have that same CMMG conversion kit. My 10/22 takedown with BX trigger and BX-25 mags shoots better. I'm interested to see what folks come up with though.

    Yea looking for "better" accuracy. I have a 10/22 with bull target barrel that is awesome. No way I'm expecting that good out of anything.
    The conversion kit is fine for offhanded indoor range work at 25 yards but I want to offhand at 100 yards to ping my thin steel and not spend $ on the 223 rounds while still having the same AR trigger and weight of the gun.

    I'd be ecstatic with with 2MOA
     

    DutchV

    Ultimate Member
    Jul 8, 2012
    4,703
    I'd ask CMMG directly. You're better off with a dedicated .22 LR barrel. The gas port and tube on a DI barrel can get leaded up. Then it's a drag to get clean.
     

    Melnic

    Ultimate Member
    MDS Supporter
    Dec 27, 2012
    15,282
    HoCo
    I'd ask CMMG directly. You're better off with a dedicated .22 LR barrel. The gas port and tube on a DI barrel can get leaded up. Then it's a drag to get clean.

    yea, I sent them an email but with their notice about high volume, not sure how soon they would get back to me. Wanna hear from anyone who has done this.
     

    John from MD

    American Patriot
    MDS Supporter
    May 12, 2005
    22,734
    Socialist State of Maryland
    If you buy a CMMG .22 LR barrel, you will also have to buy the barrel adapter to connect to your conversion unit. The conversion unit uses an adapter with a front end shaped like a .223 cartridge. The adapter used with a dedicated barrel has a little nub in the front and the bullet has less jump into the rifling.

    With match ammo, a good scope and a good trigger, you will probably be able to get 1 moa depending on the wind. With bulk stuff it will probably be more like 2 TO 4 MOA.

    As for leading the gas tube, I have been shooting .22 conversions since Jon Ciener starting selling them. All you have to do is fire a couple of .223 rounds and the lead is gone. The only area that needs cleaning is the tail of the bolt where some lead build up collects. This doesn't have to be done often if you shoot a couple of rounds of .223 after your .22lr sessions.
     

    gwoodburn

    Active Member
    Feb 9, 2012
    124
    Owings Mills, MD
    Check out this site:

    https://www.righttobear.com/22LR-parts-upgrades-accessories-s/1873.htm

    They should have all you need to do a dedicated 22lr upper. I think their house brand is just rebranded CMMG so I wouldn't hesitate to get their stuff if it's cheaper.

    Like John said, since you have a conversion kit already, you should only need to replace the barrel collar on your bolt. The only other thing you'll need is a dedicated 22lr barrel.

    I have a PSA dedicated upper that shoots really well, but I've been toying with the idea of doing a 4.5" or 9" suppressed upper for a pistol build. When I finally pull the trigger, I'll most likely be buying from RTB. Best prices I've found and they have good reviews.
     

    Melnic

    Ultimate Member
    MDS Supporter
    Dec 27, 2012
    15,282
    HoCo

    alucard0822

    For great Justice
    Oct 29, 2007
    17,643
    PA
    get a dedicated barrel and collar, pull the legs of the converison bolt apart to slide the 223 chamber adapter off, pop the dedicated 22 collar on, replace the barrel, and put it together. I have the RTB M4 profile barrel, and it's decently accurate, within 1" at 25yds, about the same as a box-stock 10/22, better than the conversion in a 223 twist rate barrel, but not as good as most any decent 22. Did take a little polishing of the feed ramp for mine to run 100%, and I only use CCI subsonic and standard velocity ammo, it was hanging up when chambering. It's fun to build a 22 AR, or in my case, turn an old AR I never shot into a 22 suppressor host, but they just aren't as good as a model built for 22 from the ground up.
     

    Melnic

    Ultimate Member
    MDS Supporter
    Dec 27, 2012
    15,282
    HoCo
    well, I noticed the RTB M4 barrel was $99 deal of the day ($109 normally) so I pulled the trigger and have parts on order.

    Too bad I did not think of this earlier, otherwise I'd have some more projects to do while at home.

    I already have a spare stripped Upper and a hand guard
    What I ordered:
    RTB22LR16M RTB 22LR M4 Barrel On sale for $99.99 (Deal of the day)
    https://www.righttobear.com/searchresults.asp?Search=RTB22LR16M
    RTB-22BA415 RTB 22LR collar
    https://www.righttobear.com/searchresults.asp?Search=RTB-22BA415
    RTB-22BA596 Charging Handle
    https://www.righttobear.com/searchresults.asp?Search=RTB-22BA596
     
    Last edited:

    Melnic

    Ultimate Member
    MDS Supporter
    Dec 27, 2012
    15,282
    HoCo
    well, I noticed the RTB M4 barrel was $99 deal of the day ($109 normally) so I pulled the trigger and have parts on order.

    Too bad I did not think of this earlier, otherwise I'd have some more projects to do while at home.

    Shipped today so I'll be putting it together this weekend.
    Hard part will be finding a place to shoot it.
     

    Melnic

    Ultimate Member
    MDS Supporter
    Dec 27, 2012
    15,282
    HoCo
    Parts came in

    Taking the 223 Adapter collar off and then putting the new one on was a piece of cake!
    I have the tools to build AR uppers so I put this barrel in and grabbed a spare A2 brake and put it together in about 15 minutes.
    I have spare optics to put on it so that is next. I'll just grab a 3-9x rimfire scope and plunk it on to test the accuracy before putting on a relfex, fixed 4x scope or red dot.
    If I like this, I"ll put a shorter handguard on it from Joebobs.

    I pulled the bullet and powder out of a 22LR and test fired it and it popped the rim primer just fine and ejected.

    Oh yea, Spikes Lower procured years ago from 2A sales in Jessup and Geissele SSA trigger.

    e9233d519c81ca4cf19824563196ea4d.jpg



    Sent from my iPhone using Tapatalk
     

    John from MD

    American Patriot
    MDS Supporter
    May 12, 2005
    22,734
    Socialist State of Maryland
    Parts came in

    Taking the 223 Adapter collar off and then putting the new one on was a piece of cake!
    I have the tools to build AR uppers so I put this barrel in and grabbed a spare A2 brake and put it together in about 15 minutes.
    I have spare optics to put on it so that is next. I'll just grab a 3-9x rimfire scope and plunk it on to test the accuracy before putting on a relfex, fixed 4x scope or red dot.
    If I like this, I"ll put a shorter handguard on it from Joebobs.

    I pulled the bullet and powder out of a 22LR and test fired it and it popped the rim primer just fine and ejected.

    Oh yea, Spikes Lower procured years ago from 2A sales in Jessup and Geissele SSA trigger.

    e9233d519c81ca4cf19824563196ea4d.jpg



    Sent from my iPhone using Tapatalk


    Nice. I see you have one of those scary magazines too! :lol:
     

    Melnic

    Ultimate Member
    MDS Supporter
    Dec 27, 2012
    15,282
    HoCo
    Nice. I see you have one of those scary magazines too! :lol:

    Magazine is Gray, so that means its only partially scary now isn't it HAHA.

    I have a PSA dedicated upper that shoots really well, but I've been toying with the idea of doing a 4.5" or 9" suppressed upper for a pistol build. When I finally pull the trigger, I'll most likely be buying from RTB. Best prices I've found and they have good reviews.

    I got all amped up watching a guy with a pistol build and arm brace with 9" pistol build but I'll take things one step at a time :)
    I have 2 SBR lowers, Can't recall (have to look into it) if the 29" OAL applies to 22LR or not.
    One advantage of pistol build and pistol brace is I can shoot it at the Pistol Range of AGC cause its pistol and pistol caliber
     

    Melnic

    Ultimate Member
    MDS Supporter
    Dec 27, 2012
    15,282
    HoCo
    Do you need a .22 receiver to build this or will any receiver work?

    Any:
    My upper and Lower are regular AR multi caliber upper/lowers.
    Only thing special is the CMMG Bolt assembly, Magazine and the Barrel.

    So, if you had a dedicated 22LR upper assembly (like what I put togeher), here is a MD compliant bolt/magazine kit
    https://www.righttobear.com/RTB-Ded...ag-Kit-10-Round-p/rtb-22ba487-rtb-22afc1d.htm

    If you want to use an existing 223 AR upper, you get one of the below:
    https://www.righttobear.com/CMMG-drop-in-22-conversion-kit-Bravo-SS-w-3-p/22ba6ae.htm
    https://www.righttobear.com/CMMG-drop-in-22-conversion-kit-Bravo-SS-w-1-p/22ba62f.htm
    or the CMMG kit (I had mine ship to store in DE to make a legal purchase)
    https://www.cabelas.com/product/CMMG-LR-AR-Conversion-Kit/753246.uts?slotId=7

    What you might find is that by the time you add the kit, the mags and the upper assembly parts, you are pretty close to a S&W 15-22
    Since my purchases were incremental and I already had a stripped upper, handguard, & Brake, I went to the 22LR AR upper route.

    What I get out of it is the same weight, feel and Trigger as my ARs I use but cheap shooting ammo to get me and my son shooting offhand work at steel at 100 yards.
     

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