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Old March 20th, 2020, 09:28 AM #1
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dedicated 22LR upper with CMMG AR conversion

OK,
What kind of barrel would I need here.
I have one of these CMMG conversion kits.
https://www.cabelas.com/catalog/prod...abc1d26e31bba6

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-s...40cm-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.
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Old March 20th, 2020, 09:33 AM #2
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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.
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Old March 20th, 2020, 09:40 AM #3
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Quote:
Originally Posted by PowPow View Post
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
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Old March 20th, 2020, 09:47 AM #4
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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.
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Old March 20th, 2020, 10:49 AM #5
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Quote:
Originally Posted by DutchV View Post
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.
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Old March 20th, 2020, 11:08 AM #6
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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.
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Old March 20th, 2020, 11:52 AM #7
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Check out this site:

https://www.righttobear.com/22LR-par...ies-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.
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Old March 20th, 2020, 12:15 PM #8
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RTB is having some really good sale prices right now. Now if only one of my guns would sell.
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Old March 20th, 2020, 12:28 PM #9
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surprise surprise surprise St. Carter.
I got a response from them:

It will if you use this in lieu of the chamber adapter:

https://cmmginc.com/product/barrel-c...mbly-22arc-ss/

RTB link: (note its the same part #)
https://www.righttobear.com/RTB-22LR...tb-22ba415.htm

Now, just need to pick the barrel. HMM wonder which is more accurate?
https://www.righttobear.com/22LR-AR1...els-s/1907.htm
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Old March 20th, 2020, 12:31 PM #10
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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.
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