| Platform | Mk4 |
| Caliber | 5.56x45mm |
| Operating System | Compact Action-Direct Impingement |
| Barrel Length | 10.5 |
| Barrel Twist | 1:7 |
| Barrel Contour | MT |
| Barrel Material | 4140CM, SBN |
| Barrel Twist | 1:7 |
| Muzzle Device | CMMG ZEROED Blast Compensator |
| Muzzle Thread | 1/2 x 28 |
| Gas Port Location | Pistol |
| Gas Block | Adjustable .750" |
| Upper Receiver | DISSENT 7075 T6 Aluminum |
| Hand Guard | CMMG 9.6" Proprietary |
| Finish | Cerakote |
| Charging Handle | DISSENT Side Charger - Left |
| Buffer Type | N/A |
| Receiver Extension | 1913 Picatinny Rail End Cap |
| Stock / Brace | N/A |
Please Allow 15-30 Days To Process Your Order.
State/local restrictions may apply in CA, CO, CT, DE, DC, HI, IL, MD, MA, MI, NJ, NY, or WA. Customers must review our Firearms Shipping Policy prior to ordering.
Firearms with attached pistol brace. Please confirm your FFL is accepting transfers for pistol brace equipped firearms prior to ordering.
UPPER GROUP, DISSENT, Mk4, 5.56MM, 10.5"
Let’s face it, the 6.5” DISSENT 5.56 is a ton of fun, and it’s rowdy! Now that we got that out of our system, our ears quit ringing, and we aren’t seeing fireballs anymore, we are able to bring the same patent pending compact action to even more people with the arrival of the 10.5” DISSENT. A longer barrel will give improved ballistics, while the DISSENT’s compact platform still keeps this as a small, but powerful pistol to fill your needs.
It’s no secret that pistol stabilizing braces have been a target for scrutiny over the years, and those that enjoy building their own AR pistols have wondered what will come out of all the uncertainty. DISSENT is our answer. Utilizing our patent pending direct impingement Compact Action, DISSENT upper groups house the entire action and recoil assembly in the upper receiver resulting in less bulk and length than traditional AR pistols. The forward non-reciprocating side charger allows for quick bolt operation without coming off target.
DISSENT Upper groups include a 1913 Picatinny rail end plate to use in place of the lower receiver buffer tube.
Adjustable Gas Block
If you’re looking to shoot suppressed or just fine tune your DISSENT to your preferred ammo, the adjustable gas block gives you the freedom to dial in the gas system exactly to your liking. Never too much and never too little.
Lifetime Quality Guarantee
We aim to please, that’s why every CMMG product is backed by our Lifetime Quality Guarantee against material and workmanship defects. Learn More.
*NFA Rules May Apply
6.5" DISSENT upper groups are made to be used in a pistol configuration, using a pistol upper in conjunction with a stock or stabilizing brace on the lower receiver may make your DISSENT and SBR and subject to NFA rules. Learn more about NFA rules.