| Platform | Mk57 |
| Caliber | 5.7x28mm |
| Operating System | Compact Action-Radial Delayed Blowback |
| Barrel Length | 6.5 |
| Barrel Twist | 1:9 |
| Barrel Contour | MT |
| Barrel Material | 4140CM, SBN |
| Barrel Twist | 1:9 |
| Muzzle Device | CMMG ZEROED Linear Compensator |
| Muzzle Thread | 1/2 x 28 |
| Gas Port Location | N/A |
| Gas Block | N/A |
| Upper Receiver | DISSENT 7075 T6 Aluminum |
| Lower Receiver | Mk57 Forged 7075 T6 Aluminum |
| Hand Guard | CMMG 5.5" Proprietary |
| Finish | Cerakote |
| Charging Handle | Dissent Side Charger - Reversible |
| Pistol Grip | CMMG ZEROED Pistol Grip |
| Buffer Type | N/A |
| Receiver Extension | DISSENT Folding Stock Adapter |
| Stock / Brace | DISSENT Side Folding Stock |
| Trigger Type | ZEROED Drop-In |
| Trigger Guard | Integrated |
| Safety Selector | CMMG ZEROED 60/90 Degree |
| Magazine | 20rd Promag |
| Weight | 5.7 lbs |
| Length | 16.5" - 26" |
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.
SBR, DISSENT, Mk57, 5.7x28MM, 6.5"
The search for the ultimate 5.7x28mm SBR is over. The Mk57™ DISSENT® combines our patent-pending Compact Action along with the CMMG® Radial Delayed Blowback™ operating system and Mk57 platform lower to give shooters something hard to beat. A PDW that accepts FN®* Five-seveN®* pattern pistol magazines for the ultimate degree of cross-compatibility.
Although small and lightweight, the 5.7 round is no slouch. Originally designed to maximize carrying capacity while still delivering rifle-like ballistic performance in a variety of weapon platforms, 5.7x28mm is right at home in the DISSENT providing capable ballistics with very little felt recoil.
Available in a variety of custom Cerakote finish options; the rear of the DISSENT SBR features the DISSENT side folding stock with adjustable length of pull and adjustable cheek riser. A forward non-reciprocating charging handle allows for quick and easy manipulation without coming off target and the M-LOK handguard with top picatinny rail provides ample mounting space for whatever accessories you please.
Compact Action Radial Delayed Blowback™ Operating System
Originally developed for the .45 ACP MkG platform, CMMG has adapted our Radial Delayed Blowback system across our pistol caliber lineup to create pistols and rifles with a softer recoil impulse and reduced bolt weight compared to traditional straight blowback systems. Now with the advent of our patented Compact Action in every DISSENT, Radial Delayed Blowback can be had in bufferless form. Check out our CMMG Resources article & video to learn more about what sets Radial Delayed Blowback apart.
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.
**All NFA rules apply** NFA Rules Apply All DISSENT SBRs (short barrel rifles) require additional ATF paperwork & processing time. See linked CMMG Resource article for more information. Learn more about NFA rules.
~ Firearms shipping to states with magazine capacity restrictions will only ship with 10rd magazines in place of standard capacity magazines. CMMG does not address any other state compliancy requirements for further restricted states.
