The CMMG Dissent Mk4 Upper in 5.56x45mm NATO is a bufferless 10.5 assembly featuring a 1:7 twist barrel with a Black finish and 1/2x28 threads. This system utilizes patent-pending Compact Action technology, housing the entire recoil assembly within the Armor Black Cerakote aluminum receiver. It includes a 9.6 M-LOK handguard, a left-side non-reciprocating charging handle, and a ZEROED Blast Compensator. This complete upper ships with a 1913 Picatinny rail end plate, allowing for use on any standard AR-platform lower receiver without a buffer tube.