CMMG 55A1A0B-MB | DISSENT MK4 | 5.56 NATO | 16.1 in

The CMMG DISSENT MK4 is an AR-pattern rifle chambered for .223 Remington/5.56 NATO that pairs a 16.1 inch steel-threaded barrel with an adjustable gas block and a side folding stock for compact transport. It includes an M-LOK handguard with a top Picatinny rail, an ambidextrous control set, and a Zeroed drop-in single stage trigger for consistent pull. For an optic under $1000 that complements this rifle’s intended use, the Vortex Strike Eagle 1-6×24 offers a versatile low-power variable suited to both close-quarters transitions and extended precision at intermediate ranges.

Applications for this platform include range training and practical competition shooting, where a durable, adjustable gas system and modular mounting options are valuable.

Product Specifications

• The manufacturer is CMMG.
• The model and part number are 55A1A0B-MB (DISSENT MK4).
• The caliber is listed as .223 Remington / 5.56 NATO.
• The barrel measures 16.1 inches and is steel threaded.
• The rifle features a CMMG Dissent side folding stock with adjustable length of pull and cheek riser.
• The gas system includes an adjustable gas block for suppressed or unsuppressed operation tuning.
• The trigger is a Zeroed drop-in single stage design.
• The rifle uses an ambidextrous control set.
• The handguard is M-LOK with a top Picatinny rail for accessory mounting.
• The muzzle device is a CMMG Zeroed muzzle brake.
• The rate of twist is 1:7.
• The listed capacity is 30 + 1.
• The overall length is listed as 27.60 to 37 inches depending on stock position.
• The primary receiver material is aluminum.
• The UPC is 810103479975.

The DISSENT MK4 balances modularity and control: a threaded steel barrel and adjustable gas block give you options for suppressed use or tuning to match specific ammunition, while the M-LOK handguard and continuous top rail simplify accessory placement. The folding stock reduces transport length without compromising an adjustable cheek riser for consistent sight alignment.

Choose this configuration if you value a tunable gas system, a compact folding stock for transport, and a robust mounting platform for optics and accessories. The rifle’s feature set supports serious range work and competitive formats without excessive complexity.

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