Revanchist Airsoft goes over the Holosun 507Comp which comes with Competition Reticle System. The 507Comp-RD is a handgun sight with a large lens and a long-lasting battery. It has a new system that lets you choose from four different reticles, each with a red dot and a circle of different sizes. The sight is made of strong aluminum and has a feature that turns it on when you shake it.