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  #1  
Old 12-31-2020, 03:03 PM
jerdog3 jerdog3 is offline
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Will a CMMG .22 LR Magazine Work in the M&P 15-22? Will a CMMG .22 LR Magazine Work in the M&P 15-22? Will a CMMG .22 LR Magazine Work in the M&P 15-22? Will a CMMG .22 LR Magazine Work in the M&P 15-22? Will a CMMG .22 LR Magazine Work in the M&P 15-22?  
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Default Will a CMMG .22 LR Magazine Work in the M&P 15-22?
Have any of you tried to use a CMMG .22LR mag, that comes with their AR 15 to .22lr conversion kit, in your M&P 15-22?
Thank you!
jerdog3
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Old 12-31-2020, 03:20 PM
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vipermd vipermd is offline
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Will a CMMG .22 LR Magazine Work in the M&P 15-22? Will a CMMG .22 LR Magazine Work in the M&P 15-22? Will a CMMG .22 LR Magazine Work in the M&P 15-22?  
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NO Why would you try to convert a 22lr to a 22lr? They are designed to fit into AR-15 not 15-22. Be Safe,
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Old 01-01-2021, 04:09 AM
jerdog3 jerdog3 is offline
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Will a CMMG .22 LR Magazine Work in the M&P 15-22? Will a CMMG .22 LR Magazine Work in the M&P 15-22? Will a CMMG .22 LR Magazine Work in the M&P 15-22? Will a CMMG .22 LR Magazine Work in the M&P 15-22? Will a CMMG .22 LR Magazine Work in the M&P 15-22?  
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NO Why would you try to convert a 22lr to a 22lr? They are designed to fit into AR-15 not 15-22. Be Safe,
My question was, "Will a CMMG .22 LR Magazine Work in the M&P 15-22?" That was the title of the thread, so I'm not trying to convert a .22LR to a .22LR. Maybe I worded it poorly.
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Old 01-01-2021, 12:59 PM
Kp321 Kp321 is offline
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Will a CMMG .22 LR Magazine Work in the M&P 15-22? Will a CMMG .22 LR Magazine Work in the M&P 15-22? Will a CMMG .22 LR Magazine Work in the M&P 15-22? Will a CMMG .22 LR Magazine Work in the M&P 15-22? Will a CMMG .22 LR Magazine Work in the M&P 15-22?  
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The answer is no. (I just tried in mine). The conversion mags are too deep, front to back, to fit into the 15-2 mag well. With enough time and tools, they might be made to work but with 15-22 mags readily available, why try?
The reverse will work, the 15-22 mags will work in an AR conversion with a shim to stabilize them.
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Old 01-01-2021, 01:52 PM
jerdog3 jerdog3 is offline
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Will a CMMG .22 LR Magazine Work in the M&P 15-22? Will a CMMG .22 LR Magazine Work in the M&P 15-22? Will a CMMG .22 LR Magazine Work in the M&P 15-22? Will a CMMG .22 LR Magazine Work in the M&P 15-22? Will a CMMG .22 LR Magazine Work in the M&P 15-22?  
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Originally Posted by Kp321 View Post
The answer is no. (I just tried in mine). The conversion mags are too deep, front to back, to fit into the 15-2 mag well. With enough time and tools, they might be made to work but with 15-22 mags readily available, why try?
The reverse will work, the 15-22 mags will work in an AR conversion with a shim to stabilize them.
Perfect answer! Thank you so much! I am getting my kid an M&P 15-22 and wanted to see if all the CMMG mags I have will work. Oh well, no big deal.

Happy New Year!
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Old 01-04-2021, 11:35 AM
cyphertext cyphertext is offline
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Will a CMMG .22 LR Magazine Work in the M&P 15-22? Will a CMMG .22 LR Magazine Work in the M&P 15-22? Will a CMMG .22 LR Magazine Work in the M&P 15-22? Will a CMMG .22 LR Magazine Work in the M&P 15-22? Will a CMMG .22 LR Magazine Work in the M&P 15-22?  
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Originally Posted by jerdog3 View Post
Perfect answer! Thank you so much! I am getting my kid an M&P 15-22 and wanted to see if all the CMMG mags I have will work. Oh well, no big deal.

Happy New Year!
I actually went the other way. Purchased a "ready mag" and installed it in the lower of my CMMG so that I could use M&P 15-22 magazines. Holds the bolt open after the magazine is ejected and allowed me to pick up magazines locally that were on sale, and the kid and I could use the same magazines.
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Old 01-04-2021, 01:18 PM
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Will a CMMG .22 LR Magazine Work in the M&P 15-22? Will a CMMG .22 LR Magazine Work in the M&P 15-22? Will a CMMG .22 LR Magazine Work in the M&P 15-22? Will a CMMG .22 LR Magazine Work in the M&P 15-22? Will a CMMG .22 LR Magazine Work in the M&P 15-22?  
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Originally Posted by cyphertext View Post
I actually went the other way. Purchased a "ready mag" and installed it in the lower of my CMMG so that I could use M&P 15-22 magazines. Holds the bolt open after the magazine is ejected and allowed me to pick up magazines locally that were on sale, and the kid and I could use the same magazines.
I did the same but the CMMG 22LR/ ready mag/ 15-22 mags combo fouled up %50 faster and made my 8yr old son take my 15-22. He eventually only wanted to shoot the 15-22. So I sold the CMMG upper and have 2 15-22s, soon 3. The daughter hates to share too.

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