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CMMG, Inc 22LR Mk4 Upper Receiver Groups

CMMG, Inc Upper Group, Mk4LE, 22LR 22B7C51
CMMG, Inc Upper Group, Mk4 PDW, 22LR 22B8F26
CMMG, Inc Upper Group, Mk4 T, 22LR 22B7CA4
CMMG, Inc Upper Group, Mk4 HT, 22LR 22B3035
CMMG, Inc Upper Group, Mk4, A4, 22LR 22B6A72
CMMG, Inc Upper Group, Mk4LE, 22LR 22B7C51
1 of 5 images
CMMG, Inc Upper Group, Mk4LE, 22LR 22B7C51
CMMG, Inc Upper Group, Mk4 PDW, 22LR 22B8F26
2 of 5 images
CMMG, Inc Upper Group, Mk4 PDW, 22LR 22B8F26
CMMG, Inc Upper Group, Mk4 T, 22LR 22B7CA4
3 of 5 images
CMMG, Inc Upper Group, Mk4 T, 22LR 22B7CA4
CMMG, Inc Upper Group, Mk4 HT, 22LR 22B3035
4 of 5 images
CMMG, Inc Upper Group, Mk4 HT, 22LR 22B3035
CMMG, Inc Upper Group, Mk4, A4, 22LR 22B6A72
5 of 5 images
CMMG, Inc Upper Group, Mk4, A4, 22LR 22B6A72

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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
View All Q&A You Have a Question? Ask!
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 ...
Read More...
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 ...
Read More...
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 ...
Read More...
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
Previous
Best Rated
Eley Ammunition Eley Ammo Tenex .22lr 40gr. Eps
Eley Ammunition Eley Ammo Tenex .22lr 40gr. Eps
(15)
As Low As (Save Up to 40%)
$26.89
$0.54 - $0.59/Round
See all 2 models
Eley Ammunition Eley Tenex Rapid Fire Pistol 22lr 40gr Rn
Eley Ammunition Eley Tenex Rapid Fire Pistol 22lr 40gr Rn
(1)
List: $30.00
$29.39
$0.59/Round
Best Rated
Eley Ammunition Eley Ammo Target .22lr 40gr. Round Nose 50-pack
Eley Ammunition Eley Ammo Target .22lr 40gr. Round Nose 50-pack
(29)
List: $20.52 (Save 58%)
$8.59
$0.17/Round
CCI Ammunition Uppercut .22 Long Rifle 32 Grain Jacketed Hollow Point JHP Nickel Plated Rimfire Ammo, 50 Rounds, 960CC
CCI Ammunition Uppercut .22 Long Rifle 32 Grain Jacketed Hollow Point JHP Nickel Plated Rimfire Ammo, 50 Rounds, 960CC
(6)
List: $13.99 (Save 29%)
$9.99
$0.20/Round
Best Rated
Eley Ammunition Match EPS .22 Long Rifle 40 Grain Flat Nose Brass Cased Rimfire Ammo, 50 Rounds, 01100
Eley Ammunition Match EPS .22 Long Rifle 40 Grain Flat Nose Brass Cased Rimfire Ammo, 50 Rounds, 01100
(20)
List: $39.82 (Save 45%)
$21.99
$0.44/Round
Winchester Super-X RIMFIRE .22 Long Rifle 25 grain #12 Shot Rimfire Ammo, 50 Rounds, X22LRS
Winchester Super-X RIMFIRE .22 Long Rifle 25 grain #12 Shot Rimfire Ammo, 50 Rounds, X22LRS
List: $17.79 (Save 16%)
$14.99
$0.30/Round
Best Rated
Eley Ammunition Eley Ammo Club .22LR 40GR. Round Nose 50 Rounds
Eley Ammunition Eley Ammo Club .22LR 40GR. Round Nose 50 Rounds
(15)
List: $10.50
$9.99
$0.20/Round
Eley Ammunition Outlaw .22LR 40 Grain Lead Solid Semi Auto Benchrest Rimfire Ammo, 50 Rounds, 02320
Eley Ammunition Outlaw .22LR 40 Grain Lead Solid Semi Auto Benchrest Rimfire Ammo, 50 Rounds, 02320
List: $21.81 (Save 53%)
$10.19
$0.20/Round
Best Rated
Aguila Ammunition Colibri .22LR 420fps. 20 Grain Lead Round Nose, Brass Case, Ammo, 50 Rounds, 1B220337
Aguila Ammunition Colibri .22LR 420fps. 20 Grain Lead Round Nose, Brass Case, Ammo, 50 Rounds, 1B220337
(16)
List: $7.49
$7.29
$0.15/Round
CCI Ammunition Clean-22 Blue .22 Long Rifle 40 Grain Lead Round Nose Rimfire Ammunition
CCI Ammunition Clean-22 Blue .22 Long Rifle 40 Grain Lead Round Nose Rimfire Ammunition
(3)
As Low As (Save Up to 11%)
$12.89
$0.12 - $0.13/Round
See all 2 models
Best Rated
CCI Ammunition Blazer Rimfire .22 Long Rifle 38 Grain Lead Round Nose Rimfire Ammunition
CCI Ammunition Blazer Rimfire .22 Long Rifle 38 Grain Lead Round Nose Rimfire Ammunition
(38)
As Low As (Save Up to 11%)
$39.49
$0.09/Round
See all 2 models
Fiocchi .22LR 0 Grain Brass Blank Ammo, 200 Rounds, 22LRBL
Fiocchi .22LR 0 Grain Brass Blank Ammo, 200 Rounds, 22LRBL
List: $45.99 (Save 10%)
$41.49
$0.21/Round
Aguila Ammunition .22 Long Rifle Super Max, 30 Grain, Brass Cased, Centerfire Rimfire Ammunition
Aguila Ammunition .22 Long Rifle Super Max, 30 Grain, Brass Cased, Centerfire Rimfire Ammunition
(1)
As Low As (Save Up to 23%)
$9.09
$0.18 - $0.19/Round
See all 2 models
SUPERNOVA .22 Long Rifle 40 Grain Lead Round Nose Green and Red Tracer Rifle Ammo, 12 Rounds, PMSN22LR-MP
SUPERNOVA .22 Long Rifle 40 Grain Lead Round Nose Green and Red Tracer Rifle Ammo, 12 Rounds, PMSN22LR-MP
List: $14.28 (Save 27%)
$10.39
$0.87/Round
Remington 22 Viper .22 Long Rifle 36 Grain Truncated Cone Solid Bullet Brass Rimfire Ammunition
Remington 22 Viper .22 Long Rifle 36 Grain Truncated Cone Solid Bullet Brass Rimfire Ammunition
(3)
As Low As (Save Up to 10%)
$6.39
$0.13/Round
See all 3 models
Winchester M-22 .22 Long Rifle 40 Grain Copper Plated Lead Round Nose Rimfire Ammunition
Winchester M-22 .22 Long Rifle 40 Grain Copper Plated Lead Round Nose Rimfire Ammunition
(6)
As Low As (Save Up to 32%)
$83.49
$0.08 - $0.09/Round
See all 2 models
Remington Golden Hunter 22LR 40 Grain Plated Hollow Point Rimfire Ammunition
Remington Golden Hunter 22LR 40 Grain Plated Hollow Point Rimfire Ammunition
(1)
As Low As (Save Up to 12%)
$11.39
$0.10 - $0.11/Round
See all 2 models
Aguila Ammunition .22 Long Rifle 20grain Standard Velocity Solid Point Brass Cased Pistol Ammo, 20 Rounds, 1B222600
Aguila Ammunition .22 Long Rifle 20grain Standard Velocity Solid Point Brass Cased Pistol Ammo, 20 Rounds, 1B222600
List: $10.89
$10.49
$0.52/Round
Best Rated
Remington 22 Golden Bullet .22 Long Rifle 36 Grain Plated Hollow Point Brass Rimfire Ammunition
Remington 22 Golden Bullet .22 Long Rifle 36 Grain Plated Hollow Point Brass Rimfire Ammunition
(8)
As Low As (Save Up to 11%)
$11.99
$0.09 - $0.12/Round
See all 4 models
Rws Blanks.22-6mm Rimfire Noise Only Blanks 100-pack
Rws Blanks.22-6mm Rimfire Noise Only Blanks 100-pack
List: $19.99 (Save $1.20)
$18.79
$0.19/Round
Best Rated
Federal Premium BYOB .22 Long Rifle 36 Grain Copper Plated Hollow Point Rimfire Ammunition
Federal Premium BYOB .22 Long Rifle 36 Grain Copper Plated Hollow Point Rimfire Ammunition
(18)
As Low As (Save Up to 11%)
$50.19
$0.09 - $0.11/Round
See all 2 models
Best Rated
SK Rifle Match .22 Long Rifle 40 grain Lead Round Nose Brass Cased Rimfire Ammo, 50 Rounds, 420108
SK Rifle Match .22 Long Rifle 40 grain Lead Round Nose Brass Cased Rimfire Ammo, 50 Rounds, 420108
(42)
List: $14.85 (Save 13%)
$12.89
$0.26/Round
Best Rated
Remington Subsonic .22 Long Rifle 40 Grain Copper Plated Hollow Point Brass Rimfire Ammunition
Remington Subsonic .22 Long Rifle 40 Grain Copper Plated Hollow Point Brass Rimfire Ammunition
(9)
As Low As (Save Up to 12%)
$7.49
$0.15/Round
See all 2 models
Best Rated
Remington 22 Thunderbolt .22 Long Rifle 40 Grain Round Nose Brass Rimfire Ammunition
Remington 22 Thunderbolt .22 Long Rifle 40 Grain Round Nose Brass Rimfire Ammunition
(11)
As Low As (Save Up to 10%)
$4.79
$0.10/Round
See all 2 models
D.t. Systems .22 Blanks Light Powerloads For Dt Launcher 100
D.t. Systems .22 Blanks Light Powerloads For Dt Launcher 100
List: $27.99 (Save 41%)
$16.59
$0.17/Round
Best Rated
CCI Ammunition Blazer .22 Long Rifle 40 Grain Lead Round Nose Rimfire Ammunition
CCI Ammunition Blazer .22 Long Rifle 40 Grain Lead Round Nose Rimfire Ammunition
(29)
As Low As (Save Up to $27.00)
$4.69
$0.09/Round
See all 2 models
Best Rated
Aguila Ammunition Super Colibri 22LR 590fps. 20 Grain Lead Round Nose, Brass Case, Ammo, 50 Rounds, 1B220339
Aguila Ammunition Super Colibri 22LR 590fps. 20 Grain Lead Round Nose, Brass Case, Ammo, 50 Rounds, 1B220339
(7)
List: $7.59
$7.29
$0.15/Round
Best Rated
Winchester Super Suppressed .22 Long Rifle 45 Grain Subsonic Lead Round Nose Rimfire Ammunition
Winchester Super Suppressed .22 Long Rifle 45 Grain Subsonic Lead Round Nose Rimfire Ammunition
(5)
As Low As (Save Up to 43%)
$14.89
$0.11 - $0.15/Round
See all 2 models
Best Rated
Winchester .22 Long Rifle 36 grain Copper Plated Hollow Point Rimfire Ammunition
Winchester .22 Long Rifle 36 grain Copper Plated Hollow Point Rimfire Ammunition
(5)
As Low As (Save Up to 42%)
$26.69
$0.08/Round
See all 3 models
Best Rated
Aguila Ammunition Standard .22 Long Rifle 40 Grain Lead Solid Point Brass Cased Rimfire Ammo, 50 Rounds, 1B220332
Aguila Ammunition Standard .22 Long Rifle 40 Grain Lead Solid Point Brass Cased Rimfire Ammo, 50 Rounds, 1B220332
(21)
List: $3.79
$3.59
$0.07/Round
Remington 22 Yellow Jacket .22 Long Rifle 33 Grain Truncated Cone Hollow Point Brass Rimfire Ammunition
Remington 22 Yellow Jacket .22 Long Rifle 33 Grain Truncated Cone Hollow Point Brass Rimfire Ammunition
As Low As (Save Up to 11%)
$6.69
$0.13/Round
See all 2 models
Federal Champion .22 Long Rifle 36 Grain Lead Hollow Point Rimfire Ammunition
Federal Champion .22 Long Rifle 36 Grain Lead Hollow Point Rimfire Ammunition
As Low As (Save Up to 10%)
$28.09
$0.08 - $0.09/Round
See all 2 models
Winchester Suppressed .22LR 45 Grain Black Copper Plated Round Nose Brass Cased Rifle Ammunition, 350 Rounds, SUP22LRB2
Winchester Suppressed .22LR 45 Grain Black Copper Plated Round Nose Brass Cased Rifle Ammunition, 350 Rounds, SUP22LRB2
List: $39.95 (Save 15%)
$34.09
$0.10/Round
Best Rated
CCI Ammunition Stinger .22LR 32 Grain Hollow Point Copper Rimfire Ammunition
CCI Ammunition Stinger .22LR 32 Grain Hollow Point Copper Rimfire Ammunition
(27)
As Low As (Save Up to 10%)
$9.89
$0.20/Round
See all 2 models
Best Rated
SK Long Range Match .22 Long Rifle 40 grain Lead Round Nose Brass Cased Rimfire Ammo, 50 Rounds, 420158
SK Long Range Match .22 Long Rifle 40 grain Lead Round Nose Brass Cased Rimfire Ammo, 50 Rounds, 420158
(20)
List: $16.20 (Save 13%)
$14.09
$0.28/Round
Best Rated
Aguila Ammunition .22LR 40 Grain Plated Lead Round Nose, Brass Case, Ammo, 500 Rounds, 1B221115
Aguila Ammunition .22LR 40 Grain Plated Lead Round Nose, Brass Case, Ammo, 500 Rounds, 1B221115
(39)
List: $37.49 (Save $1.20)
$36.29
$0.07/Round
Eley Ammunition Eley Ammo Contact Subsonic .22lr 42gr. Round Nose 50-pack
Eley Ammunition Eley Ammo Contact Subsonic .22lr 42gr. Round Nose 50-pack
(3)
List: $12.00 (Save 18%)
$9.79
$0.20/Round
Winchester .22LR 36 Grain Copper Plated Hollow Point Brass Cased Rifle Ammunition, 1000 Rounds, 22LR1KHP
Winchester .22LR 36 Grain Copper Plated Hollow Point Brass Cased Rifle Ammunition, 1000 Rounds, 22LR1KHP
List: $102.00 (Save 20%)
$81.49
$0.08/Round
CCI Ammunition Clean-22 Suppressor .22 Long Rifle 45 Grain Lead Round Nose Rimfire Ammo, 200 Rounds, 980CC
CCI Ammunition Clean-22 Suppressor .22 Long Rifle 45 Grain Lead Round Nose Rimfire Ammo, 200 Rounds, 980CC
(5)
List: $40.99 (Save 11%)
$36.49
$0.18/Round
Best Rated
Aguila Ammunition Standard Subsonic .22 Long Rifle 40 Grain Solid Point, Brass Case, Ammo, 50 Rounds, 1B220269
Aguila Ammunition Standard Subsonic .22 Long Rifle 40 Grain Solid Point, Brass Case, Ammo, 50 Rounds, 1B220269
(13)
List: $5.79
$5.59
$0.11/Round
Next

Ammo Boxes

1–7 / 7
Previous
MTM Ammo Box .22lr 100-rounds, Clear Blue, P-100-22-24
MTM Ammo Box .22lr 100-rounds, Clear Blue, P-100-22-24
(3)
List: $7.79 (Save 46%)
$4.19
Tiger Rock 22 Ammo Box, 22BOX
Tiger Rock 22 Ammo Box, 22BOX
$10.00
Berrys 63600 Ammo Box 22 LR 100rd Clear/Black
Berrys 63600 Ammo Box 22 LR 100rd Clear/Black
(2)
List: $3.99 (Save 40%)
$2.39
Berrys 835 Ammo Box 22 LR 1rd Blue Lid W/Black Bottom
Berrys 835 Ammo Box 22 LR 1rd Blue Lid W/Black Bottom
List: $3.39 (Save 29%)
$2.39
MTM 200 Round 22 Long Rifle Ammo Box, SB20020
MTM 200 Round 22 Long Rifle Ammo Box, SB20020
(1)
$27.99
MTM 200 Round 22 Long Rifle Ammo Box, SB20032
MTM 200 Round 22 Long Rifle Ammo Box, SB20032
(1)
List: $28.59 (Save 28%)
$20.50
Best Rated
MTM Ammo Wallet .22 Caliber 30 Cartridge Smoke
MTM Ammo Wallet .22 Caliber 30 Cartridge Smoke
(6)
List: $16.39 (Save 45%)
$8.99
Next

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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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