Reviews & Ratings for CMMG DISSENT 9mm, 10.5in Upper Receiver — 2 reviews — Page 1

The action on this upper is super slick, it is in fact the slickest semi-auto action I've ever felt and owned. It is near effortless to charge, there is no grittiness or stutters, its just smooth and slick. The upper is heavy though, this is probably due to the handguard and heavy barrel contour, this 10.5" upper on a mil spec lower weighs a whole pound more than my 16" Stribog SP9A3, furthermore the majority of the weight is in the front so its very reminiscent of a piston upper. They should absolutely offer a lighter contour barrel and I don't know why they went with 10.5", they should've offered it as a 8.5" barrel like the previous Banshee line. 10.5" is a little too long and 6.5" is okay but the handguard is too short, 8" would've been perfect. I do have a non-functioning 8" Banshee and I've thought about swapping out the barrels because apparently they are the same exact barrels but then I would have to find a new handguard that isn't available. I had to slightly sand down the top of the picatinny adapter since it was such a tight fit that the rear receiver pin wouldn't line up but this does make for a tight fit between the receivers with no wobble whatsoever. A ejection port cover would've been nice too.

One important spec that isn't available anywhere is that the picatinny section is raised .275" compared to a mil spec AR upper, so throwing a 1.57" red dot mount on this upper actually makes it sit at 1.84", this assumes that you mount your stock/brace inline with the...
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So before I had any idea about buying the Dissent I had a budget 9mm upper I built from Midway. I became interested in getting a different 9mm upper due to my old upper having two out of battery detonations (which was mostly my fault, I shot reloaded ammo I made with all lead projectiles, the lead bullet I pressed got shaved off at the case mouth and increased the diameter of the round) which to say the least is a unpleasant experience.
My choice was either the Dissent or the Banshee. The Banshee however didn't have an extracter built into the upper so if you had a round in the bcg, getting it off the bcg without firing it can be an issue. Also the barrel options were more limited, I wanted a 10.5 so I can add a barrel extension to make it legal here in CA but didn't want to go 16in.
I have the Dissent mated with a Spikes Tactical 9mm lower with LRBHO that I'm happy to say is working wonderfully. I've shot about 120 rounds so far and had zero issues. The recoil is lighter, the gun itself is lighter and just looking at it and feeling it in my hands, it feels like it's a real quality firearm. It was pretty pricey for me to purchase but I have zero regrets thus far.