CMMG Banshee Mk4 Pistol .300 BLK 8″ 30+1 FDE

About this product

The CMMG Banshee Mk4 is a compact AR-pattern pistol designed for short-barrel performance and modularity. This configuration is chambered in .300 BLK and fitted with an 8-inch 4140CM barrel with a 1:7 twist for reliable operation in short-barrel and suppressed setups. The Mk4 platform includes CMMG ZEROED controls and an M-LOK-compatible EML7 handguard for flexible accessory mounting. Intended for range use and practical short-range applications, it balances compact handling with AR-style ergonomics.

Key Specifications

• Chambered in .300 BLK.
• Barrel length is 8 inches.
• Barrel material is 4140CM SBN.
• Barrel twist is 1:7.
• Muzzle threads are 5/8 x 24.
• Gas block is adjustable .750″.
• Handguard is the CMMG EML7 M-LOK.
• Upper receiver is Billet 6061 T6 Aluminum.
• Lower receiver is Mk4 Forged 7075 T6 Aluminum.
• Standard magazine capacity is 30+1.

Built around CMMG’s Mk4 architecture and ZEROED controls, the Banshee Mk4 offers a compact, configurable platform for shooters who prioritize a short overall length and straightforward customization. With billet and forged receivers, an M-LOK handguard, and a 30+1 capacity, it provides a capable baseline for range duty and short-range applications while leaving room for user-selected accessories and optics.

Related Videos: