CMMG BANSHEE MK4 Upper Group 5.56×45 10.5

The CMMG BANSHEE MK4 Upper Group in 5.56x45 is an ultra-compact AR15 upper assembly with a 10.5 barrel. It is built on CMMG's Mk4 platform and ships complete with a bolt carrier group and ZEROED accessories. Designed for compact AR15 builds, this upper balances reduced overall length with a factory-complete accessory suite.

Key Specifications

• Built on the Mk4 platform.
• The caliber is 5.56x45mm (5.56mm).
• The operating system is Direct Impingement.
• The barrel length is 10.5.
• The barrel twist is 1:7.
• The barrel contour is MR.
• 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 ships ready to integrate into a compact AR15 build, offering factory-installed ZEROED components and a billet receiver that supports modern configurations. Its short overall length and complete accessory package simplify assembly while retaining parts that support modular setups. For builders prioritizing compactness and a factory-complete upper, the BANSHEE MK4 presents a practical, ready-to-install option.