CMMG Banshee Mk4 Upper Group 5.56×45 12.5

The CMMG BANSHEE MK4 Upper Group is a compact AR-platform upper intended for use on Mk4 or standard AR-15 lowers. It is chambered for 5.56x45 and ships complete with bolt carrier group and CMMG ZEROED accessories. The 12.5 barrel and M-LOK handguard support compact builds such as AR pistols or SBRs where maneuverability is a priority.

Key Specifications

• The platform is Mk4.
• The caliber is 5.56mm 5.56x45mm.
• The operating system is Direct Impingement.
• The barrel length is 12.5.
• The barrel twist is 1:7.
• The barrel contour is MR.
• The barrel material is 4140CM SBN.
• The muzzle device is the CMMG ZEROED Linear Compensator.
• The upper receiver is Billet 6061 T6 Aluminum.
• The hand guard is the CMMG EML11 M-LOK.

This upper group is built to integrate with Mk4/standard AR-15 lowers and comes equipped with ZEROED accessories to simplify assembly. Its compact profile and accessories make it a practical option for users seeking a maneuverable, high-quality upper for compact rifle or pistol-style AR builds.