Product DescriptionThe CMMG DISSENT MK4 complete upper group is a compact 5.56x45mm NATO solution for AR-platform builders who want a streamlined, no-buffer style upper assembly. Built around CMMG's patent-pending Compact Action with a fixed ejector, the entire action and recoil assembly is housed in the upper receiver to reduce bulk and overall length compared to traditional AR configurations. A forward, non-reciprocating left-side charging handle enables fast manipulation while maintaining your sight picture. This upper features a 10.5-inch barrel, a 9.60-inch M-LOK handguard for accessory mounting, and a CMMG Zeroed Blast Comp at the muzzle. A 1913 Picatinny rear end plate is included for compatibility with 1913-mounted accessories in place of a buffer tube. Upper receiver only.Product Highlights CMMG DISSENT MK4 complete upper group for AR-platform builds (upper only) Forward, non-reciprocating left-side charging handle for quick, on-target operation 10.5-inch 5.56 NATO barrel with 1:7 twist and 1/2x28 muzzle threads 9.60-inch M-LOK handguard provides a slim, modular accessory interface Includes 1913 Picatinny rear end plate as an alternative to a buffer tube setupSpecs Brand: CMMG Model/Series: DISSENT MK4 Caliber: 5.56x45mm NATO Barrel Length: 10.5 inches Twist Rate: 1:7 Handguard: 9.60-inch M-LOK Muzzle Device: CMMG Zeroed Blast Compensator Muzzle Thread Pattern: 1/2x28 Receiver Material: 7075-T6 aluminum Finish/Color: Armor Black (Cerakote noted by some retailers) Compatibility: Fits AR-platform (upper receiver assembly only) Included: 1913 Picatinny rail end plate UPC: 810097509276 Manufacturer Part Number: 55B8D86ABDisclaimer: 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.