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CMMG Mk4 Upper

Written on Jul 12, 2022

This is an excellent upper receiver. Fit nice and snug on my lower receivers. Matches great with my Noveseke billet lower. Also, it matches perfectly with my SLR Helix handguard. The profile looks like they were built to match. If you have a handguard with anti rotation tabs, these may not work. The ejection port section matches perfectly with the V7 and FCD EPC. Minus 1/2 star because they could've done without the cutouts and design cuts. I am not a fan of them but that is just me. However, it's a nice upper with nice M4 feed ramps, barrel extension fit snug as well. No issues at all for me.
3 of 3 found the following review helpful.

Good Mag catch assembly

Written on May 20, 2021

I bought a couple of these and they are pretty good. Nice matte finish and all threaded in very nicely. These are noticeably nicer than ones you would get from a regular milspec lower parts kit. These would be good to have for spare parts.

Surprisingly good

Written on Apr 25, 2021

I was looking for an inexpensive tube for a budget build. This buffer tube is nicely machined. Very nice coating on the inside and very smooth on the outside. My SBA3 and SBA4 slides really smooth and clicks into the 8 positions nicely. Fluting looks great.
6 of 6 found the following review helpful.

Do not buy

Written on Mar 13, 2021

This is too long to fit in any of my lower receivers. The inside part touches the receiver wall so it won't let me actuate it to catch the bolt. Also, the padde is too small and much shorter than a mil spec one.
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Last updated 2026-10-03 UTC.