A realistic stationary sci-fi military turret defense system mounted on a reinforced concrete and metal base. The turret has dual rotating gun barrels, armored plating, targeting sensors, hydraulic mechanisms, and detailed wiring. Hard-surface mechanical design with realistic metallic materials, bolts, and panels. The environment suggests a futuristic military base. Highly detailed geometry, PBR textures, suitable for Unreal Engine or Unity, photorealistic 3D mesh model.