CMMG BANSHEE MK4 UPPER GROUP 4.6X30MM 8 BLK

CMMG introduced the 4.6x30mm platform to the U.S. civilian market and the Banshee Mk4 Upper Group continues that approach. This upper group is designed for use with any standard AR15 lower receiver and CMMG FourSix magazines and ships complete with a bolt carrier group and CMMG ZEROED accessories. The package is built to support compact PDW-style AR builds while maintaining compatibility with common AR-15 components.

Key Specifications

• The platform is Mk4.
• The caliber is 4.6x30mm.
• The operating system is Direct Impingement.
• The barrel length is listed as 8.
• The barrel twist is 1:5.9.
• The barrel contour is MT.
• The barrel material is 4140CM SBN.
• The muzzle device is a CMMG ZEROED Linear Compensator.
• The muzzle thread is 1/2 x 28.
• The upper receiver is Billet 6061 T6 Aluminum.

This upper group combines CMMG engineering with modular AR compatibility: a compact barrel profile, M-LOK handguard, and the CMMG ZEROED accessory suite provide a ready foundation for a compact defensive or general-purpose AR build. The Banshee Mk4 upper is intended for shooters seeking a low-recoil, compact configuration while retaining AR15 lower compatibility and established component interfaces.