Designed for Service Rifle competition in the M16A2/AR-15A2, our 22 caliber bullets have set an incredible number of new national records. With the introduction of the 80 grain #9390, the M16 family of rifles really became a force to be reckoned with in National Match competition. Because of its extreme length, the 80 grain MatchKing requires a twist rate not slower than 18 inches. However, it must be seated to an OAL that requires single loading in the M16/AR-15 series