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Reviews & Ratings for CMMG Mk4 9mm Resolute Upper Group Receiver
— 2 reviews — Page 1
by
Kirbo40,
Verified Owner
from TX, United States
Written on September 2, 2024
Paired this with a PSA lower with EPT trigger and B5 furniture in coyote color. The Midnight Bronze and the Coyote complement each other. The upper and lower mated together with no wiggle at all. Put 150 rounds thru it so far and this is almost like shooting a .22 rifle. It is accurate and the most fun I've had in a long time. No malfunctions so far feeding it 115 and 124 gr. cheap Monarch ammo. Makes me want to build an 8" version now.
Would recommend: Yes
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by
MLone,
Verified Owner
from FL, United States
Written on December 21, 2023
I purchased this upper for my Banshee lower. The colors are both midnight bronze but they dont match. I really dont care about that as much as I care about function. The upper is well built as all CMMG's are. I have only used it for 50yd shots so far but I want to see what the 9mm will do at 100. I had a cheap optic on it and was still able to put 10 rounds in an inch at 50. Ordered a new optic to go to 100. It cycled very well with it failing to lock on the last round only one time on the first 30 round mag. I ran 250 rounds through it. I'm running a POF trigger with a KynShot 5007 hydraulic buffer, A5 buffer tube, and Tubb 556 flatwire spring in the lower. All this makes this gun a real soft shooter. I recommend this upper to anyone wanting to reach out a little bit with 9mm. No muzzle rise and a soft shooter makes this an excellent gun for beginners.
Pros:
Well built & very functional
Easy to grab around hand guard
Excellent for home defense
Cons:
has some weight to it
Would recommend: Yes
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