CMMG conversion kit + 22lr barrel question - Page 1

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[ARCHIVED THREAD] - CMMG conversion kit + 22lr barrel question

Posted: 6/5/2017 8:15:32 PM EDT

Does the conversion kit work with a dedicated 22 barrel? It looks like there would be a fitment issue between the barrel and bolt extension

Posted: 6/5/2017 8:22:32 PM EDT

[#1]

you have to replace the 'bullet shaped' part of the kit with a collar that is made to fit the dedicated barrel..

Brian

Posted: 6/5/2017 9:51:54 PM EDT

[#2]

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Quoted:
you have to replace the 'bullet shaped' part of the kit with a collar that is made to fit the dedicated barrel..

Brian

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+1

And if you. It the collar you can use the unit in your dedicated barrel or remove the collar and put back on the chamber adapter use the conversion in a 5.56 upper.

Note however to swap the collar and chamber adapter does require bending the 22 conversion's arms and doing it a lot could and likely would eventually cause problems.

Fwiw, I love my CMMG dedicated 22 upper even though my 10/22s get more range time.

Posted: 6/13/2017 10:21:19 PM EDT

[#3]

Are there instructions anywhere on how to do this?
I just got the 9" barrel and the Bravo conversion.
How does one remove the fake cartridge on the conversion?

Posted: 6/14/2017 6:47:51 AM EDT

[#4]

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Quoted:
How does one remove the fake cartridge on the conversion?

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CMMG .22 LR Conversion for AR-15 (Take down)

https://www.youtube.com/watch?v=j0iwQxpwXQ0

Posted: 6/14/2017 9:45:41 AM EDT

[#5]

Well, that's stupid easy.
Thanks
Now, I feel like an idiot.
Oh well, my problem is solved

Posted: 6/14/2017 12:46:21 PM EDT

[#6]

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Quoted:
Now, I feel like an idiot.

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I wouldn't.

The fellow in the video makes it look slightly harder than it needs to be. I would hold the bolt back with a string or zip-tie so you aren't using one hand just for that. Then I'd rotate the collar out of one side, spreading the arms just enough to let one side pass.

The arms look robust, but I've read that disassembly can have them mis-aligned or worn out over time. I suspect that some people may be rougher than necessary in this process.

Posted: 6/14/2017 2:36:33 PM EDT

[#7]

zukiphile right on the money here.

If you buy a CMMG barrel can get the "collar" that replaces the "cartridge shaped" piece to make it run. For what its worth I ended up replacing the extractor and firing pin to get mine running as reliable as I wanted.

Posted: 6/14/2017 3:59:44 PM EDT

[#8]

Quote History

Quoted:

If you buy a CMMG barrel can get the "collar" that replaces the "cartridge shaped" piece to make it run. For what its worth I ended up replacing the extractor and firing pin to get mine running as reliable as I wanted.

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I bought the CMMG. I've only had it disassembled once to polish the rails and feed ramp and try some ideas for buffers.

Did you use another CMMG firing pin and extractor, or did you use Taccom parts?

Posted: 6/14/2017 4:37:05 PM EDT

[#9]

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Quoted:

I bought the CMMG. I've only had it disassembled once to polish the rails and feed ramp and try some ideas for buffers.

Did you use another CMMG firing pin and extractor, or did you use Taccom parts?

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I bought the Taccom. The recoil spring the kit comes with is not of appropriate size to keep it from binding and it also is lighter in spring rate. I was having issues with the bolt coming all the way closed causing misfires so after the spring slipped the rod and jammed my weapon up after 3 shots I took it all apart and put the factory spring back. Firing pin seems good but honestly the pressure plug in the buffer tube has likely made the biggest difference.

Posted: 6/14/2017 7:00:58 PM EDT

[#10]

Yep, the bullet shaped collar just pops off and put in the CMMG one. Takes no time at all. I build mine a couple years ago with the cmmg 22lr barrel and it runs great. I like using it with the 50 round blackdog machine drums.

Posted: 6/14/2017 10:08:01 PM EDT

[#11]

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Quoted:

I bought the Taccom. The recoil spring the kit comes with is not of appropriate size to keep it from binding and it also is lighter in spring rate. I was having issues with the bolt coming all the way closed causing misfires so after the spring slipped the rod and jammed my weapon up after 3 shots I took it all apart and put the factory spring back. Firing pin seems good but honestly the pressure plug in the buffer tube has likely made the biggest difference.

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I think you just saved me a couple of dollars. I was going to round out an order to Taccom with spare recoil springs; I'll get CMMG instead. (I hear about how these wear out and cause damage from hard cycling, but they are so much more robust than 10/22 recoil springs, It's hard to see how this could be.)

The firing pin interested me too. I guess these conversion bolt firing pins break with an unusual frequency. Taccom says that theirs is harder, but my sense is that harder may mean more brittle as well.

I keep trying to think of a way to jerryrig a pressure plug, but most things are more expensive and would be harder to use.

Thanks for the benefit of your experience.

Posted: 6/14/2017 10:52:09 PM EDT

[#12]

Red Green handyman special for TACCOM pressure plug replacement, a couple of quarters in front of the buffer held in place by Duct Tape. This is a quick and easy solution if your not switching uppers and using the same lower for a centerfire upper.

I found once I went to two stage match triggers I rarely break a firing pin. When I was using Mil Spec FCG I was regularly breaking firing pins. YMMV

I still keep a couple of spare firing pins in my parts bin. Black Dog Machine also sell firing pins and extractors if your ordering magazines.

Posted: 6/15/2017 6:50:59 AM EDT

[#13]

Quote History

Quoted:
Red Green handyman special for TACCOM pressure plug replacement, a couple of quarters in front of the buffer held in place by Duct Tape. This is a quick and easy solution if your not switching uppers and using the same lower for a centerfire upper.

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Quote History

Quoted:
Red Green handyman special for TACCOM pressure plug replacement, a couple of quarters in front of the buffer held in place by Duct Tape. This is a quick and easy solution if your not switching uppers and using the same lower for a centerfire upper.

The 50 cent solution? I'll try it.

EDIT - now you have me thinking of supergluing a few pennies onto a crumby buffer. That's my two cents for the moment.

Quoted:

I found once I went to two stage match triggers I rarely break a firing pin. When I was using Mil Spec FCG I was regularly breaking firing pins. YMMV

I still keep a couple of spare firing pins in my parts bin. Black Dog Machine also sell firing pins and extractors if your ordering magazines.

I only have S&W magazines and a Boonie Packer adapter at this point. I'll take a look at BDM.

I also have some Rock River two stage triggers that I've tuned to my satisfaction, and I've never had a problem with one in a centerfire, but I hear they won't stand up to 22lr use. Sounds like I need a Geissele or MBT. Your observation is appreciated in part because I hate single stage MIL triggers.

Posted: 6/16/2017 11:11:23 AM EDT

[#14]

They make a great dedicated or conversion kit. Just call their tech support line and they seem very knowledgeable.

[ARCHIVED THREAD] - CMMG conversion kit + 22lr barrel question

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