Winchester NATO-Spec Army Primers 41 are the identical primers Employed in the Lake Town five.56mm ammunition. These primers are developed to exacting technical specs for shot to shot regularity. All primers are continually and rigorously examined for consistency and sensitivity at temperatures and ailments considerably past the variety of ordinary usage. Winchester guarantees very carefully-controlled weights of primer mixtures, consistency in dimension and good quality, exact winchester 41 primers measurements and tolerances for anvil heights and security in extremes of temperatures and humidity.