Product Description The CMMG DISSENT Upper Group in Armor Black is a precision-engineered MK4 platform upper receiver assembly chambered in .300 AAC Blackout, built for shooters who demand a compact, reliable, and highly capable AR-style build. Utilizing CMMG&';s patent-pending Compact Action Direct Impingement system, the entire action and recoil assembly is housed within the upper receiver, yielding a noticeably shorter and lighter package than traditional AR platforms. The 14.5" barrel comes with the CMMG ZEROED SVD Brake pinned and welded to the muzzle, bringing the overall barrel length to a legally compliant 16.1" and allowing the use of standard stocks and braces without any NFA SBR registration. Whether you are starting a fresh bufferless build or adding options to an existing DISSENT lower, this upper group delivers outstanding versatility and performance. A forward non-reciprocating reversible side charging handle enables fast bolt manipulation without breaking your target acquisition, and an adjustable 0.750" gas block lets you dial in the gas system perfectly for suppressed shooting or a wide range of .300 BLK ammunition. Every CMMG product is backed by a Lifetime Quality Guarantee against material and workmanship defects. Product Highlights Patent-pending Compact Action Direct Impingement system houses the full action and recoil assembly in the upper receiver for a shorter, more compact profile than traditional ARs 14.5" 4140CM steel barrel with SBN finish and CMMG ZEROED SVD Brake pinned and welded to a legally compliant 16.1" overall barrel length -- no SBR required Adjustable 0.750" gas block allows precise tuning for suppressed or subsonic .300 AAC Blackout loads as well as a wide variety of supersonic ammunition CMMG 13.5" proprietary handguard paired with a full-length top Picatinny rail and DISSENT reversible side charging handle for rapid, accurate bolt operation Armor Black Cerakote finish over a DISSENT 7075-T6 aluminum upper receiver for superior corrosion resistance, hardness, and lasting durability Specs Brand: CMMG MPN: CMM30B8A6FAB UPC: 810097502499 Finish: Armor Black (Cerakote) Platform: MK4 Caliber: .300 AAC Blackout Operating System: Compact Action - Direct Impingement Barrel Length: 14.5" Barrel Twist: 1:7 Barrel Contour: MT Barrel Material: 4140CM, Salt Bath Nitrided (SBN) Muzzle Device: CMMG ZEROED SVD Brake, Pinned and Welded Muzzle Thread: 5/8 x 24 Overall Barrel Length (with brake): 16.1" Gas Port Location: Carbine Gas Block: Adjustable, 0.750" Upper Receiver: DISSENT 7075-T6 Aluminum Handguard: CMMG 13.5" Proprietary Charging Handle: DISSENT Side Charger - Reversible Weight: 4.0 lbs. Length: 23.6" 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.