CMMG Banshee MK4 55AC20AAB | 5.56 | 12.5in

The CMMG Banshee Mk4 is a compact AR-style pistol chambered in .223 Rem/5.56 NATO that pairs carbine-like ballistics with a short 12.5 inch barrel for enhanced maneuverability. Built on CMMG’s Mk4 platform, this version includes EML M-LOK handguards, ZEROED controls, and a threaded medium-taper barrel finished in Cerakote. For an optic choice under $1000 that complements the platform’s intended use, consider a 1-6x low-power variable optic such as the Vortex Strike Eagle 1-6×24 for fast acquisition at close ranges and usable magnification for accurate sighting.

Applications: range training and short-range competition or precision work from a compact chassis are appropriate uses for this AR pistol.

Product Specifications

• The firearm is chambered in .223 Rem/5.56 NATO.
• The action is Semi-Auto.
• The barrel measures 12.50 inches and is a medium taper contour.
• The barrel material is 4140CM SBN and features a 1:7 twist rate.
• The muzzle device is a CMMG ZEROED Linear Comp and the barrel is threaded 1/2 x 28.
• The gas port is located at carbine length and uses a 0.750 non-adjustable gas block.
• The upper is billet 6061 T6 aluminum and the lower is Mk4 forged 7075 T6 aluminum.
• The handguard is a CMMG EML11 M-LOK with full-length M-LOK slots.
• The finish is Cerakote in black.
• The pistol ships with a Magpul 30rd PMAG and the capacity is 30+1.
• The pistol grip is a CMMG ZEROED unit and the trigger is a ZEROED drop-in single stage.
• The safety is a CMMG ZEROED 60/90 degree ambidextrous selector and the charging handle is a CMMG ZEROED ambidextrous unit.
• The receiver extension is a CMMG 6-position Fastback and the brace is a CMMG RipBrace pistol brace.
• The UPC is 810148624309.

This Banshee Mk4 configuration brings a compact, highly modular AR pistol package with factory-installed ambidextrous controls and M-LOK attachment points that allow for practical accessory placement without excess weight. The threaded 12.5″ medium-taper barrel and ZEROED parts package make it simple to build a usable, compact system for range work and short-range competitive scenarios while maintaining common AR ergonomics.

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