The CMMG Banshee is a semi-automatic pistol chambered in 5.7x28mm with an 8-inch barrel and 20-round capacity. It ships optics-ready with no sights installed, leaving the top rail open for whatever optic suits the user's application. 
 

Key Specifications 

• SKU: 2024036508 
• UPC: 810148624378 
• Condition: New in Box 
• Safety: CMMG Zeroed 60/90 Degree 
• Trigger: Standard 
• Grip: CMMG Zeroed 
• Sights: None (optics ready) 
• Barrel Length: 8 inches 
• Capacity: 20 rounds 
• Action: Semi-Auto 
• Caliber: 5.7x28mm 
• Model Name: Banshee 
• Brand: CMMG 
   

Detailed Features 

The 8-inch barrel gives the 5.7x28mm cartridge room to develop velocity while keeping the overall package compact enough for close-quarters use. The CMMG Zeroed grip is shaped for consistent hand placement, which helps with control during faster firing. The 60/90-degree safety is easy to manipulate without shifting grip. 
 
With 20 rounds on tap and the relatively flat-shooting characteristics of 5.7x28mm, the Banshee handles both range work and home defense applications without requiring significant setup changes between uses.

The CMMG Banshee G1 in 5.7x28mm draws consistent interest from shooters who want something different from standard 9mm or .45 ACP platforms. The lightweight, compact build and optics-ready setup are regularly cited as highlights, particularly for users who want to run a red dot from the start.

Reliability and smooth operation come up frequently in positive reviews, with most users reporting clean cycling across different load types. The 20-round capacity is generally seen as adequate for the platform's intended uses.

The main concerns in discussions are price relative to other options in the category and ammunition availability. 5.7x28mm is less common than major handgun calibers, which affects both cost and practical access for regular range training. Shooters who already have a supply of the cartridge tend to be more satisfied with the value proposition.