Winchester NATO-Spec Armed forces Primers forty one are a similar primers Utilized in the Lake Town five.56mm ammunition. These primers are developed to exacting requirements for shot to shot regularity. All primers are continuously and rigorously examined for regularity and sensitivity at temperatures and disorders far past the choice of normal usage. Winchester guarantees meticulously-managed weights of primer winchester 41 primers mixtures, consistency in dimensions and high-quality, specific measurements and tolerances for anvil heights and steadiness in extremes of temperatures and humidity.