The Dboys Marine M4 is an excellent CQB weapon. This gun features full metal construction, retractable crane stock, and full metal RIS with rail covers. The shortened barrel, retractable stock, and front foregrip all add to the guns maneuverability. The RIS is also great for adding accessories like flashlights, laser sights, and optics. A unique feature of the Marine M4 RIS AEG is the raised top rail. This allows you to add optics that are not obstructed by the front sight post.