Winchester NATO-Spec Armed forces Primers 41 are a similar primers Employed in the Lake City five.56mm ammunition. These primers are created to exacting requirements for shot to shot regularity. All primers are constantly and winchester 41 primers rigorously examined for regularity and sensitivity at temperatures and disorders far over and above the choice of normal usage. Winchester guarantees very carefully-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.