The CMMG Banshee is a semi-automatic pistol with a 12.5" barrel chambered in .300 Blackout. Its compact build makes it easy to maneuver in tight spaces, and the .300 Blackout caliber handles subsonic loads well when suppressed. 
 

Key Specifications 

• SKU: 2024036471 
• UPC: 810148623661 
• Condition: New in Box 
• Safety: CMMG Zeroed 60/90 Degree 
• Trigger: Standard 
• Grip: CMMG Zeroed 
• Sights: None (optics-ready) 
• Barrel Length: 12.5 inches 
• Capacity: 30+1 rounds 
• Action: Semi-Auto 
• Caliber: .300 Blackout 
• MPN: 30AB20FTNG 
• Model Name: Banshee 
• Brand: CMMG 
   

Features 

 
At 12.5 inches of barrel, the Banshee stays maneuverable without dropping too much velocity compared to shorter barrels. The 30+1 round capacity gives plenty of ammunition on hand for range sessions or defensive use. The .300 Blackout chambering works with both supersonic and subsonic loads — the subsonic option pairs well with a suppressor for hearing-safe shooting. The CMMG Zeroed grip and 60/90 degree safety are comfortable for most hand sizes. No sights are installed, leaving the Picatinny rail clear for whatever optic or red dot you want to run.

The CMMG Banshee in .300 Blackout with a 12.5" barrel gets a mix of positive and critical feedback.

On the positive side, users like the compact size and light weight, which makes it practical for home defense or keeping in a vehicle. The semi-auto action is reliable with quality ammunition, and the optics-ready platform is a common compliment — owners appreciate the flexibility to mount whatever optic fits their needs. Accuracy at short to moderate ranges is generally praised.

On the critical side, recoil management gets some negative comments, particularly from shooters who are newer to the platform or accustomed to lighter calibers. A handful of users report feeding issues or magazine compatibility problems, which can be frustrating. Price is another recurring complaint — most feel the build quality warrants it, but some find it hard to justify against competing options.

The broader themes in discussions are versatility and customization. The Banshee's ability to run subsonic suppressed loads alongside standard supersonic ammunition is frequently highlighted. Owners do note it rewards proper maintenance and attention to ammunition selection, and a few mention a short break-in period before it runs consistently.