Winchester NATO-Spec Navy Primers 41 are a similar primers Utilized in the Lake Town five.56mm ammunition. These primers are created to exacting technical specs for shot to shot regularity. All primers are continually and rigorously examined for consistency and sensitivity at temperatures and problems far over and above the number of usual usage. Winchester ensures meticulously-managed weights of winchester 41 primers primer mixtures, consistency in dimension and top quality, exact measurements and tolerances for anvil heights and steadiness in extremes of temperatures and humidity.