The Raven Evolution EVO series is their newest design and engineered in Canada. Built with a robust and reinforced polymer body and features full metal m-lok handguard and retractable multi-purpose polymer stock. SS6/P9/P12 models come with picatinny on the top of the handguard. M9/M12 models come with MLOK on the top of the handguard. They are otherwise identical internally and externally. Specifications Grip: Polymer pistol grip Handguard/Rail: Metal MLOK Mag Catch: Right Hand Receiver/Body: Nylon Filled Polymer with Laser Marking Selector: Right Hand Stock: Polymer Bushing / Bearings: 8mm Bearings Gear Set: 18:1 Gearbox: Full metal with true quick spring change, Standard V2 Compatible Hop-Up chamber: Polymer rotary Inner Barrel Diameter: 6.03mm Motor: High Torque Motor Quick Spring Change Trigger System: Furion ETU Drop stock adapter: Metal