"Design a cutting-edge, futuristic automatic firearm named the Smith Auto Gun

"Design a cutting-edge, futuristic automatic firearm named the Smith Auto Gun. This weapon should combine sleek modern aesthetics with high functionality. It features a modular design, allowing for customization with various attachments like scopes, suppressors, and extended magazines. The firearm has an ergonomic grip and adjustable stock for comfort during extended use.The weapon is chambered in a mid-caliber round, offering a balance between stopping power and recoil management. The gas-operated action should ensure smooth cycling, with an adjustable rate of fire, including semi-automatic, burst, and full-auto modes. Consider heat dissipation with cooling fins on the barrel or an advanced cooling system.Include intricate details on the fire selector switch, safety mechanisms, and ammunition feed system. The overall color scheme should be a blend of matte black and gunmetal gray, with subtle accents for visual appeal. The Smith Auto Gun should appear reliable, powerful, and ready for tactical or combat scenarios."