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