Winchester NATO-Spec Armed service Primers 41 are the identical primers Utilized in the Lake City 5.56mm ammunition. These primers are crafted to exacting requirements for shot to shot regularity. All primers are continually and rigorously analyzed for consistency and sensitivity at temperatures and ailments considerably further than the variety of usual utilization. Winchester ensures meticulously-controlled weights of primer mixtures, regularity in sizing and quality, specific measurements and tolerances for winchester 41 primers anvil heights and balance in extremes of temperatures and humidity.