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Questions & Answers
What lower parts kit would I need to complete my build? Expert Answer

The CMMG, Inc 22LR Mk4 Upper Receiver Group is designed to work with any Mil-spec AR15 lower receiver and the CMMG .22 LR conversion magazines.

by Ethan, Gear Expert, August 10, 2022
Are MP 15-22 magazines compatible with this or are the mp15-22 mags proprietary only to specific mp1522 product and cant be used with other 22lr ARs? Expert Answer

This CMMG, Inc 22LR Mk4 Upper Receiver Group is compatible with CMMG .22 conversion magazines in a standard AR15 style lower receiver. It will not work with M&P-15 22 magazines.

by Ethan, Gear Expert, June 24, 2022
Customer Reviews
Helpful Positive Review
Cmmg 22 ar15a4 Upper by nobby, July 19, 2017
Functions flawlessly. Very accurate at 100 yards practicing on NRA High power reduced targets. Great fun. Has the look and feel , but not the weight of original. No problem in cleanup that is experienced with the 22 conversions. The barrel is a ...
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4/4 found this helpful
Helpful Positive Review
Amazing 22LR Upper, but why no mag? by XenoEktika, December 25, 2017
Amazing quality 22LR Upper, but why no magazine included. Many 22 Lr AR uppers include the mag, but not this one. But this being my ony complaint, still going to give 5 stars, just sad I got to wait to shoot now. Wife got me this for Christmas
1/3 found this helpful
Helpful Positive Review
Works Great by Capn Mike, Verified Owner, May 16, 2017
The quality of this upper is top notch. Shoots great and is able to use Black dog mags, as well as S&W15-22 mags with the "better mag" adapter, making the last round bolt hold open fully functional. Its much more accurate than my 1/7 twist AR upper ...
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1/1 found this helpful
Most Recent Reviews
CMMG PDW 22lr upper by boots, Verified Owner, April 10, 2017
Just like the other cmmg 22lr upper long gun I have works perfect. This is used on my 22lr AR15 pistol build and already have 500rds thru it with no complaints. Got it on sale 485. w/free shipping. Very satisfied thank you optics planet for carry ...
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Read All 4 Reviews

Product Discontinued by Manufacturer

CMMG, Inc 22LR Mk4 Upper Receiver Groups has been discontinued by CMMG and is no longer available. Our product experts have helped us select these available replacements below.You can also explore other items in the Gun Parts, AR 15 Parts, Rifle Parts, AR15 Upper Receivers yourself to try and find the perfect replacement for you!

ATTENTION! We currently do not ship this product to AK, CA, HI, IL, NY, WA, P.O. Boxes, and U.S. Territories. Please see our policies for more information.

Product Info for CMMG, Inc 22LR Mk4 Upper Receiver Groups

CMMG, Inc 22LR Mk4 Upper Receiver Group available in various modificationsimage

For best performance use a round style hammer as notched hammers can cause function issues and 36 grain plated nose bullets have proven to be the best choice for function.

Package Contents:

  • CMMG, Inc 22LR Mk4 Upper Receiver Groups

Ammunition

1–40 / 40
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Related Products to CMMG, Inc 22LR Mk4 Upper Receiver Groups

CMMG, Inc 22LR Mk4 Upper Receiver Groups Unavailable & Discontinued Models

List of Unorderable Models

  • CMMG, Inc Upper Group, MK4LE, 22LR, 22B7C51 , MPN: 22B7C51 , UPC: 852005002998 , Code: 2CM-UFH-22LRUPPR-22B7C51
  • CMMG, Inc Upper Group, Mk4 PDW, 22LR 22B8F26 , MPN: 22B8F26 , UPC: 815835016054 , Code: 2CM-UFH-22LRUPPR-22B8F26
  • CMMG, Inc Upper Group, Mk4 T, 22LR 22B7CA4 , MPN: 22B7CA4 , UPC: 815835016030 , Code: 2CM-UFH-22LRUPPR-22B7CA4
  • CMMG, Inc Upper Group, Mk4 HT, 22LR 22B3035 , MPN: 22B3035 , UPC: 815835016047 , Code: 2CM-UFH-22LRUPPR-22B3035
  • CMMG, Inc Upper Group, Mk4, A4, 22LR 22B6A72 , MPN: 22B6A72 , UPC: 815835016771 , Code: 2CM-UFH-22LRUPPR-22B6A72
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