Winchester NATO-Spec Armed service Primers forty one are the same primers Utilized in the Lake Town five.56mm ammunition. These primers are created to exacting technical specs for shot to shot consistency. All primers are consistently and rigorously analyzed for regularity and sensitivity at temperatures and circumstances significantly further than the selection of standard utilization. Winchester ensures diligently-managed weights of primer winchester 41 primers mixtures, regularity in size and high quality, precise measurements and tolerances for anvil heights and balance in extremes of temperatures and humidity.