The CMMG BANSHEE Mk4 upper group is a complete AR-15 compatible assembly chambered for .300 BLK with a 12.5-length barrel. It ships with a bolt carrier group and ZEROED accessories including an ambidextrous charging handle, polymer dust cover, and CMMG ZEROED linear compensator. The billet 6061 T6 upper and CMMG EML11 M-LOK hand guard create a compact, modular platform for short-barrel AR builds. Well suited for range-focused compact setups and short-range field use.
Product Specifications
The platform is Mk4.
The caliber is .300 BLK.
The operating system is Direct Impingement.
The barrel length is 12.5.
The barrel twist is 1:7.
The barrel material is 4140CM SBN.
The barrel contour is MR.
The muzzle device is a CMMG ZEROED Linear Compensator.
The muzzle thread is 5/8 x 24.
The gas block is 0.750 Non-Adjustable.
The upper receiver is Billet 6061 T6 Aluminum.
The hand guard is a CMMG EML11 M-LOK.
The finish is Cerakote Standard.
The charging handle is CMMG ZEROED Ambi.
The UPC is 810097502499.
The BANSHEE Mk4 upper group is a purpose-built component set for building a compact .300 BLK AR platform without sourcing parts separately. Its billet receiver, integrated M-LOK hand guard, and included ZEROED accessories make it straightforward to assemble a short-barrel recreational or field-oriented AR build while retaining modularity for common AR components.
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