You loved the 6.5" DISSENT in .300 Blackout-so we took everything great about it and turned it up a notch. The new 10.5" DISSENT Upper delivers improved ballistics and an even more suppressor-friendly length, making it the perfect upgrade to complete your .300 BLK AR pistol build. With ongoing scrutiny around pistol stabilizing braces, AR pistol builders have been left with questions-DISSENT is our answer. Featuring CMMG's patent-pending Compact Action, the entire recoil system is self-contained within the upper receiver, eliminating the need for a traditional buffer tube and reducing overall bulk. The forward, non-reciprocating side charger allows fast, intuitive operation without breaking your sight picture. Each upper includes a 1913 Picatinny rear rail plate, perfect for mounting stocks or braces (where legal), and comes equipped with an adjustable gas block-giving you the flexibility to tune your setup for either supersonic or subsonic loads, especially when suppressed. Suppressed or unsuppressed, short or long-the DISSENT 10.5" .300 BLK Upper delivers adaptability and performance in one sleek package.