Hawke Sport Optics 17220 Sidewinder 30 Side Focus 1/2 Mil Dot IR Riflescope, 6-24 x 56 30mm mono-tube design - handles heavy recoil Glass etched Red/green illuminated reticle 4 inch Large side wheel Coil erector spring provides stability during recoil Locking 1/4 M.O.A target style turrets