CMMG Banshee 300 MK4 RDB 9mm Pistol for Sale – The Ultimate AR-9mm Evolution

At Langston Ammunition Store, we proudly present the CMMG Banshee 300 MK4 RDB 9mm Pistol for sale—a next-generation AR-pistol that redefines performance in the pistol-caliber carbine category. Engineered with CMMG’s patented Radial Delayed Blowback (RDB) system, the Banshee 300 MK4 delivers rifle-like reliability with significantly reduced recoil, making it the ultimate choice for home defense, competition, and tactical applications. CMMG Banshee 300 MK4 RDB 9mm Pistol for sale online, CMMG Banshee 300 MK4 RDB 9mm Pistol for sale near me

Unrivaled Performance Features

• Radial Delayed Blowback System – Smoother operation than direct blowback, with 40% less recoil and no bolt bounce
• 8″ Barrel – 1:10 twist rate, optimized for 9mm +P and suppressor use (threaded 1/2×28)
• MK4 M-LOK Handguard – Free-floated, lightweight, and fully customizable for lights, grips, and lasers
• Ambidextrous Controls – Includes bolt release, safety selector, and magazine release
• EndoMag™ Compatibility – Uses 9mm-converted AR-15 mags (or Glock mags with optional lower)
• SB Tactical SBA3 Brace – Adjustable for stability while maintaining pistol classification

Specifications

• Caliber: 9mm Luger (handles +P)

• Barrel Length: 8″ (threaded 1/2×28)

• Overall Length: 22.5″ (collapsed) / 25.75″ (extended)

• Weight: 5.2 lbs (unloaded)

• Magazine Capacity: 30+1 (included, EndoMag insert)

• Receiver: Forged 7075-T6 aluminum (Type III hardcoat)

• Trigger: Single-stage mil-spec (3.5-4.5 lb pull)

Why the Banshee 300 MK4 RDB?

• Superior Reliability – No more feeding issues common in direct blowback PCCs

• Competition-Ready – Dominates USPSA PCC and Steel Challenge matches

• Suppressor-Friendly – Reduced gas blowback for cleaner suppressed shooting

• AR-15 Platform Familiarity – Same controls, ergonomics, and modularity

Perfect For

• Home Defense – Compact size with rifle-level control

• Tactical Use – Ideal for CQB and vehicle operations

• Competition Shooting – Low recoil for faster follow-up shots

• Suppressed Shooting – Exceptionally quiet with subsonic ammo

Included

• (1) 30-round EndoMag (PMAG body)

• SB Tactical SBA3 brace

• Thread protector

The CMMG Banshee 300 MK4 RDB 9mm Pistol is the pinnacle of AR-9mm innovation—available now at Langston Ammunition Store.