First light, last light, and all day long, this Vortex Crossfire scope is perfect for your Serpent Arms .45 caliber Airgun. It will have you shooting groups and filling tags in no time. The purpose-built reticle not only gives you holdover points but it also features red and green illumination for low-light shooting. The variable 2-7 magnification power makes it perfect for a variety of shooting situations. Plus, it includes rings, flip caps, and a neoprene cover, so it’s ready to mount right out of the box. 30mm rings included have a height of 1.1" (28mm). Reticle hashmarks are labeled for crossbow distances.