concept car,Rendered by Unreal Engine 5,Streamlined sci-fi firearm,the firearm with a full sense of science and technology,complex mechanical structure,has a smooth surface and strong reflection,a combination of sci-fi style design and metallic texture,full of cyberpunk flavor,enhancing stereoscopic visual impact,side view,close-up,digital CG rendering of a futuristic minimalist design,realistic rendering,trending on ArtStation,black background,