Winchester NATO-Spec Army Primers 41 are the identical primers Employed in the Lake City 5.56mm ammunition. These primers are created to exacting technical specs for shot to shot regularity. All primers are continually and rigorously examined for regularity and sensitivity at temperatures and disorders far outside of the selection of typical utilization. Winchester ensures thoroughly-managed weights of primer mixtures, regularity in dimensions and high-quality, specific measurements and tolerances for winchester 41 primers anvil heights and steadiness in extremes of temperatures and humidity.