Winchester NATO-Spec Armed service Primers forty one are a similar primers Utilized in the Lake Metropolis five.56mm ammunition. These primers are constructed to exacting requirements for shot to shot regularity. All primers are continuously and rigorously examined for consistency and sensitivity at temperatures and disorders far over and above the number of regular utilization. Winchester ensures thoroughly-managed weights of primer mixtures, regularity in sizing and quality, precise measurements winchester 41 primers and tolerances for anvil heights and stability in extremes of temperatures and humidity.