CMMG DISSENT Upper Group MK4 5.56mm - Tungsten The CMMG DISSENT Upper Group MK4 in 5.56mm is engineered for shooters who demand compact performance without sacrificing reliability. Whether you are supplementing an existing DISSENT build or constructing a new bufferless AR from the ground up, this 16.1" barreled upper group delivers a refined shooting experience in a streamlined platform. Built around CMMG&';s patent-pending Compact Action Direct Impingement operating system, the entire action and recoil assembly is housed within the upper receiver, reducing overall bulk and length compared to traditional AR pistols. The forward non-reciprocating left-side charger enables fast, positive bolt manipulation without breaking your sight picture. Finished in Tungsten Cerakote, this upper pairs seamlessly with any mil-spec compatible lower receiver. The included 1913 Picatinny rail end plate replaces the traditional buffer tube, opening the door for folding stocks, minimalist builds, or pistol configurations with sling attachments. Product Highlights Compact Action Direct Impingement System: Houses the full action and recoil assembly inside the upper receiver for a shorter, more compact profile than traditional AR platforms. Adjustable Gas Block: The 0.750" low-profile adjustable gas block lets you fine-tune the gas system for suppressed shooting or different ammunition loads, providing optimal cycling in any condition. Non-Reciprocating Left-Side Charger: The DISSENT Side Charger allows for rapid bolt operation without disrupting your shooting position or coming off target. 1913 Picatinny Rail End Plate Included: Replaces the buffer tube for a bufferless configuration, adding versatility for pistol builds, folding stocks, and compact carbine setups. CMMG Lifetime Quality Guarantee: Backed by CMMG&';s lifetime guarantee against material and workmanship defects, ensuring long-term reliability and peace of mind. Specs Brand: CMMG MPN: CMM55BC737TNG UPC: 810103474376 Platform: Mk4 Caliber: 5.56x45mm Operating System: Compact Action - Direct Impingement Barrel Length: 16.1" Barrel Twist: 1:7 Barrel Contour: MT Barrel Material: 4140CM, Salt Bath Nitride (SBN) Muzzle Device: CMMG ZEROED Muzzle Brake Muzzle Thread: 1/2 x 28 Gas Port Location: Mid Gas Block: Adjustable 0.750" Upper Receiver: DISSENT 7075 T6 Aluminum Hand Guard: CMMG 15" Proprietary Finish: Cerakote - Tungsten Charging Handle: DISSENT Side Charger - Left Buffer Type: N/A (Bufferless) Receiver Extension: 1913 Picatinny Rail End Cap Weight: 5.05 lbs Overall Length: 25.5" Disclaimer: We strive to provide accurate and up-to-date product descriptions, specifications, and images; however, errors or omissions may occasionally occur. We are not responsible for any inaccuracies or discrepancies in the content provided. If you notice anything incorrect or unclear, please contact us so we can correct it. When in doubt, we recommend verifying details directly with the product&';s manufacturer. ]]>