Winchester NATO-Spec Army Primers 41 are a similar primers Utilized in the Lake City five.56mm ammunition. These primers are created to exacting requirements for shot to shot consistency. All primers are frequently and rigorously examined for regularity and sensitivity at winchester 41 primers temperatures and circumstances much over and above the number of normal utilization. Winchester assures cautiously-controlled weights of primer mixtures, consistency in dimension and high quality, exact measurements and tolerances for anvil heights and steadiness in extremes of temperatures and humidity.