The Valken RDA20 is a compact and lightweight sighting solution. If you feel too slow with your iron sights or don't have any sights, a 1x zoom red dot sight is a good option. The Valken RDA20 is about as compact as an Aimpoint T-1 and is designed as a cost effective alternative to them. The body of the RDA20 is made of a heavy weight nylon polymer with metal adjustment knobs and optically correct, coated lenses. Uses 1620 sized batteries (one included), has 5 brightness adjustment settings, a fine point dot reticle, and mounts to standard 20mm rails. It sits at a standard sight height, so scope risers for non mask uses are not required. If you do use a mask, you may want to consider using a scope riser.