Reviews & Ratings for CMMG 22LR Mk4 Barrel Kits w/ Collar — 11 reviews — Page 1

Very impressed with the CMMG .22LR barrel and included collar. The barrel was extremely accurate, and it fed quality .22LR ammunition reliably without any issues. The included collar is a nice addition and made installation straightforward. Overall, this has been a great upgrade and performed exactly as I hoped. I would definitely recommend it to anyone looking for a reliable and accurate .22LR setup.

I recently installed the CMMG MK4 .22LR Barrel Kit on my BCM AR-15 upper and it completely transformed my plinking sessions into awesomeness. The 9.2” M4-profile barrel with its 1:16 twist and salt bath nitride finish delivers impressive accuracy, easily grouping tight with standard .22LR ammo and stabilizing everything from cheap bulk packs to high-velocity rounds.
Building a dedicated .22LR upper was straightforward thanks to the included barrel collar and quality construction, and it runs flawlessly on standard AR lowers without the headaches of a typical conversion kit.
Recoil is virtually nonexistent, making it perfect for extended range time or introducing new shooters, and the 1/2x28 threading pairs beautifully with suppressors for that satisfying quiet experience.
Whether you’re training affordably or just want hours of reliable fun on the cheap, this kit is a game-changer that feels like a premium dedicated .22 rifle while keeping your 5.56 setup intact.
Highly recommend

Decided to put a dedicated 22 to go with the other AR's. Turned out to be a nice little tack-driver.

The only way I can recommend this to you is if you are looking for a malfunction simulator. If you want to clear failures every other, or even every round, then this is for you!!

this solid little barrel is the perfect size for my compact ar22. nice snug fit and shoots true. shipping was really fast too

I was skeptical at first, how it might not be as reliable and accurate since it’s only 9” long barrel. But I proved myself wrong, not only it ran flawlessly with all types of 22lr ammo that you can think of. Shot very accurate, close to a little over an inch & 1/2 grouping. It even ate up the 22lr golden bullet bucket o’bullets. I am very satisfied with this purchase and now I am even thinking of building a dedicated 16” barrel. Highly recommended two thumbs up ����

I already had a cmmg .22 kit conversion kit for my ar but wanted a dedicated option and found this. I built a new upper specificly for .22 and this thing works perfectly. comes with collar and you use your existing .22 bolt and works flawlessly.

Used it to build a 22 dedicated AR. I already had the Cmmg 22 conversion kit for a 5.56. Had no issues using it with this barrel. I have cycled about 500 round through it without any feed issues. Had a few rounds that didn’t fire but had a good primer strike. I blame that on the cheap box ammo.

Some reliability issues up front. Polished feed ramp and chamber. That got Federal ammo running 100%. The mags in ar's rock forward and back a bit, found out by rocking the mag forward, shoots any ammo 100%, rem, win, cci, etc. (I have 4 mags, dif mfr, all the same) currently using a wood wedge at the back, but will JB two mags. Running a Cosmic suppressor on it. Very, very accurate. Was worth the fiddling.

I purchased this for short barreled dedicated 22lr built. Installed quickly and works flawlessly. Free shipping a bit slow but arrived undamaged. Optics Planet had the best price. I would buy it again.