Hornady Critical Duty, 357 Sig, 135 Grain, FlexLock Duty, 20 Round Box 91296 Designed to meet the needs of those who demand superior barrier penetration and prefer a full-size handgun for their personal protection. Critical Duty(R) is loaded with the tough Hornady(R) FlexLock(R) bullet that delivers barrier blind performance when shot through common urban barriers.