Product DescriptionThe CMMG DISSENT MK4 complete upper group is a compact .300 Blackout upper designed to fit AR-platform lowers while eliminating the need for a traditional buffer tube. Using CMMG's Compact Action and Radial Delayed Blowback technology with a fixed ejector, the action and recoil assembly are contained inside the upper receiver for a shorter, less bulky setup than many traditional AR pistol configurations. A forward, non-reciprocating left side charging handle helps you run the bolt quickly while staying on target, and the included 1913 Picatinny rail end plate provides a solid interface for compatible rear-mounted accessories. Finished in Armor Black, this upper is built around a 6.50 inch barrel, a 4.60 inch M-LOK handguard for accessory mounting, and a CMMG Zeroed Linear Comp to direct blast forward.Product Highlights Compact DISSENT upper group design houses the action and recoil assembly in the upper receiver for reduced overall length Forward, non-reciprocating left side charging handle for fast manipulation without breaking your shooting position Chambered in .300 Blackout with a 6.50 inch barrel for a PDW-style AR-platform build 4.60 inch M-LOK handguard supports lights, hand stops, and other modern accessories Includes a 1913 Picatinny rail end plate to replace a traditional buffer tube interfaceSpecs Brand: CMMG Product Type: Complete upper receiver group Series/Model: DISSENT MK4 Caliber: .300 Blackout Barrel Length: 6.50 in Finish/Color: Armor Black Charging Handle: Left side, forward, non-reciprocating Handguard: 4.60 in M-LOK Muzzle Device: CMMG Zeroed Linear Comp Rear Interface: 1913 Picatinny rail end plate (buffer tube replacement) Firearm Fit: AR-Platform Muzzle Thread: 5/8-24 UPC: 810097509207 Manufacturer Part Number: 30B0E67ABDisclaimer: 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.