 AR-15 rifles may use a scope up to 4.5 power.The Civilian Marksmanship Program (CMP) Matches also requires shooters to begin in the standing position before moving into the sitting, kneeling, or prone positions for the rapid-fire stages.This is based on the historical origins of military rifle matches and the need to improve and maintain proficiency with military arms for military members and ready civilians for service in times of national need.