 NRA competitions do not require a competitor to begin in the standing position.In the 2016 revision of the Civilian Marksmanship Program's "Competition Rules for Service Rifle and Pistol", use of a magnification optic has been authorized, intended to represent the use of the Rifle Combat Optic (RCO) on today's M-16 and M-4 service rifles.Magnified optics are limited to a maximum 4.5x power, and can be of the fixed magnification or variable-zoom type.