The CMMG Banshee 300 MK is a compact AR-pattern semi-automatic pistol or carbine designed for personal defense, range use, and compact maneuverability. Built on CMMG’s MK series platform, it features ambidextrous controls, M-LOK handguards, and a lightweight RipBrace or adjustable stock/brace system. The Banshee 300 accepts common magazines for its chambering (e.g., Glock-pattern for 9 mm) and includes a threaded barrel for muzzle devices. Its compact size and versatility make it suitable for close-quarters applications while still leveraging AR ergonomics and accessory compatibility.
Feature
General Specification
Manufacturer
CMMG
Model
Banshee 300 MK (various calibers/configurations)
Platform
AR-pattern semi-automatic pistol/carbine
Caliber
9 mm Luger or 10 mm Auto (common Banshee 300 variants)
Operating System
Straight-blowback or radial delayed system (9 mm); direct impingement on other AR configs
Barrel Length
Compact (typically ~5″ for 9 mm variants; ~8″ for some 10 mm models)
Barrel Material/Finish
4140 Chrome Moly with nitride or Cerakote finish
Thread Pattern
1/2″-28 tpi (muzzle device ready)
Receiver Material
Forged 7075-T6 aluminum upper & lower
Handguard
Free-float M-LOK handguard (varies by length)
Controls
Ambidextrous charging handle, safety, sling plate
Trigger
Single-stage, mil-spec style
Grip
Magpul MOE or similar ergonomic pistol grip
Brace/Stock
CMMG RipBrace or adjustable stock on carbine builds
Sights
Optic-ready (no sights typically included)
Magazine Type
Varies by caliber — Glock-pattern mags for 9 mm, proprietary or others for 10 mm
Capacity
Depends on magazine (e.g., ~30+1 for 9 mm Glock mags)
Intended Use
Personal defense, compact range/field use
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