The CMMG Dissent Mk4 Upper in 300 Blackout is a bufferless 6.5 assembly featuring a 6061-T6 aluminum receiver with an Armor Black Cerakote finish. It utilizes patent-pending Compact Action and Radial Delayed Blowback technology, housing the entire recoil assembly within the receiver. This complete group includes a 4.6 M-LOK handguard, a left-side non-reciprocating charging handle, and a ZEROED Linear Compensator with a 5/8x24 thread. It ships with a 1913 Picatinny rail end plate adapter, allowing for folding stocks or sling mounts on any standard AR-platform lower receiver.