CMMG Mk4/AR-15 Forward Assist Upper Receiver Assembly Armor Black

CMMG Mk4/AR-15 Forward Assist Upper Receiver Assembly Armor Black. Specifications for CMMG Mk4/AR-15 Forward Assist Upper Receiver Assembly: Manufacturer: CMMG Color: Armor Black Finish: Cerakote Fabric/Material: Forged 7075-T6 Aluminum Gun Make: AR Platform Gun Model: CMMG Mk4 AR-15 Condition: New Package Contents: CMMG Mk4/AR-15 Forward Assist Upper Receiver Assembly What firearm models does the manufacturer say CMMG Mk4/AR-15 Forward Assist Upper Receiver Assembly is compatible with? The manufacturer says that CMMG Mk4/AR-15 Forward Assist Upper Receiver Assembly is compatible with AR-15 CMMG Mk4CMMG 55BA206-AB: Mk4/AR-15 Forward Assist Upper Receiver Assembly Armor Black