The CMMG Dissent 22 ARC is a revolutionary, bufferless .22 ARC complete upper assembly for the AR-15 (Mk4) platform. It features a 16.10 4140 steel barrel with a Salt Bath Nitride finish and a 1:7 twist. Precision-machined from 6061-T6 aluminum with a Titanium Cerakote finish, this unit utilizes CMMGs Compact Action system, which houses the entire recoil mechanism within the upper. It includes a 15 M-LOK handguard, a ZEROED Muzzle Brake, and a forward-mounted, reversible non-reciprocating side charging handle. Note: Because the recoil system is self-contained, this upper does not require a traditional buffer tube. It ships with a 1913 Picatinny rail end plate adapter to convert your standard AR-15 lower into a sleek, bufferless configuration.