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 22 LR Upper on a AR15 Platform 
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I want to build an 22 Upper using the CMMG drop in BGC, a 1:8 twist barrel , carbine length and a 22 suppressor at the end. The goal is to have a gun that is really easy to introduce someone to shooting.

I think it is all pretty good except for 2 things.
-1:8 twist is hard on 22
-Fouling of gas line

Does anyone know if a 1:16 barrel exists without a gas port (I don't think the CMMG needs gas cycling) but with the 223 chamber so the CMMG drop in will work?

If I am doing something wrong or have a better suggestion, please tell me.


Sun Nov 29, 2020 1:35 pm
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RightToBear.com (and CMMG) have a collar to adapt your conversion kit for use with a dedicated .22lr barrel. All .223 chambered barrels are going to have a gas port. Brownells has 5.56 retro A1 barrels that are 1-in-12".(They sell out quickly) I ended up just making a dedicated upper. If you find a .223 barrel with a slower twist please share it.
Good Luck


Sun Nov 29, 2020 2:29 pm
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chuckisduck wrote:
The goal is to have a gun that is really easy to introduce someone to shooting.


:thumbsup2:

Nice! A .22 rifle is the perfect first gun for someone learning to shoot.

chuckisduck wrote:
I think it is all pretty good except for 2 things.
-1:8 twist is hard on 22
-Fouling of gas line


First, I'll say that if you want to build a dedicated .22 upper and that project interests you, then go for it.

But . . . do you need to? I say no. I have a .22 conversion bolt/mags, and they work just fine.

"-1:8 twist is hard on 22" What's that mean? Accuracy suffers? I'm doubtful that it's enough to matter for someone learning to shoot.

"-Fouling of gas line" Again, I'm doubtful that this is a real problem, especially for the number of .22 rounds that will go through this gun.

Before you put too much money into the upper, I'd consider a conversion bolt . . . but also look at how much a used M&P 15/22 or similar rifle will run you. Your money might be better spent on just buying a whole gun.

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Sun Nov 29, 2020 2:36 pm
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Thanks for the advice FJ & MP. This really came as a piecemeal idea and probably should of gotten a used M&P 22, but I think you would have to thread them usually or get an adapter they sell.

I agree that accuracy is not the issue at 25 yards for someone new. I am worried about splatter hitting the baffles in the can mainly. Probably OCD'n it.

I have a cheap infrared viewscreen and scope that makes it really easy to use, but worried that cleaning out the lead with 2-3 .223 rounds may be too much shock on the electronics.


Sun Nov 29, 2020 3:09 pm
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The M&P 15/22 comes in both threaded and unthreaded versions.

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Sun Nov 29, 2020 3:15 pm
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The M&P 15/22 comes in both threaded and unthreaded versions.

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Sun Nov 29, 2020 3:15 pm
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On a related note, I have a Sig 522 that I sometimes use for teaching people . . . it works like a champ.

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Sun Nov 29, 2020 3:16 pm
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I think it will become a post-covid project (or just buying a 22 outright).


Sun Nov 29, 2020 6:00 pm
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FWIW - I started out using a CMMG conversion kit on my lefty Stag ..223/5.56 and it worked fine and was plenty accurate for all day gopher hunting to 50 yards. I
eventually built a dedicated .22lr upper using CMMG's conversion bolt, barrel collar and barrel, all left hand. Ended up with a nice, lightweight, easy to maintain, accurate weapon that would be an excellent teaching platform. No gas block and tube or buffer and spring are required. Also, the folks at CMMG were really helpful. They have left hand stuff available, but it's not a steady part of their inventory. When I would call and talk to them they alway would go to extra effort to scrounge things up for me. From the front desk ladies to the techies, I always had very good service from them.

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Sun Nov 29, 2020 7:11 pm
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I ended up taking the ots route and bought a H&K 416 22.

The Upper minus the BCG/charging handle I bought off of Diamondback on their black friday special. I can cancel it also right now, but maybe someone here can have the savings. Will post it.


Mon Nov 30, 2020 12:46 am
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Update on how that 416 is. Looks like a cool 22. Sportsmans has it for 400 so I'm curious to hear your feedback.


Sun Dec 13, 2020 12:41 am
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I have a dedicated 22 upper, and am absolutely glad I do.


Sun Dec 13, 2020 5:43 am
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Dedicated 22lrs are fun. 8" CMMG upper with a 4x FACOG and SIG 556 folding adapter. :thumbsup2:

Image
Image


Sun Dec 13, 2020 12:19 pm
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Cabela's seems to have the M&P 15-22 in stock for in store delivery.

https://www.cabelas.com/shop/en/smith-wesson-mp-15-22-sport-rimfire-rifle


Tue Dec 15, 2020 11:11 am
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