Winchester NATO-Spec Army Primers 41 are the identical primers Employed in the Lake Town 5.56mm ammunition. These primers are created to exacting technical specs for shot to shot consistency. All primers are continually and rigorously examined for regularity and sensitivity at temperatures and conditions much over and above the number of regular utilization. Winchester ensures thoroughly-managed weights of primer mixtures, regularity in dimensions and high-quality, precise winchester 41 primers measurements and tolerances for anvil heights and stability in extremes of temperatures and humidity.