CMMG BANSHEE MK4 5.7x28mm 6.5" - AR-15 Pistol

The CMMG BANSHEE MK4 5.7x28mm 6.5" brings 5.7x28mm capability to an AR-15 pistol format — compact, versatile, and purpose-built for close-quarters use, truck guns, and shooters who need to move fast.

Built as a semi-automatic AR-15 pistol around 5.7x28mm and a direct impingement system, the CMMG BANSHEE MK4 5.7x28mm 6.5" delivers a proven AR-15 experience from first round to last.

Competition Ready: Pistol caliber carbines are a growing force in USPSA and other competitions — this platform is well-suited for PCC-class competition straight from the box.

Reduced Operating Costs: Running 5.7x28mm cuts per-round costs compared to rifle ammunition, extending how long you can train on a set budget without giving anything up in terms of practice value.

Familiar AR-15 Controls: Standard AR-15 ergonomics mean any AR-trained shooter can transition to this PCC with minimal adjustment — the same manual of arms, the same muscle memory.

Effective Home Defense: The 6.5" barrel optimizes 5.7x28mm velocity for defensive use while the carbine format provides handling advantages over handguns in a home or property defense role.

• Caliber: 5.7x28mm
• Barrel Length: 6.5"
• Gas System: Direct Impingement
• Handguard: Free-Float
• Muzzle Threading: 1/2x28
• Magazine Capacity: 32‑Round
• Finish: Type III Hardcoat Anodized
• Origin: Made in the USA

Built on an AR-9 lower pattern with familiar AR-15 controls. Accepts Glock-pattern or COLT SMG-pattern magazines depending on model. Compatible with standard carbine buffer setups.

Type III Hardcoat Anodized over 7075 aluminum construction gives this AR-15 pistol solid corrosion resistance and a durable surface that holds up across a wide range of storage and operating conditions.

A strong pick for USPSA PCC competition, recreational range use, and home defense. Sharing ammunition with compatible handguns simplifies logistics for range trips and everyday carry.

CMMG is recognized for their innovative radial-delayed blowback operating system, a uniquely reliable PCC design trusted by competitors and enthusiasts who demand consistent function. Made in the USA.