Winchester NATO-Spec Military Primers forty one are the exact same primers Employed in the Lake Town five.56mm ammunition. These primers are crafted to exacting specifications for shot to shot consistency. All primers are frequently and rigorously analyzed for consistency and sensitivity at temperatures and situations significantly further than the selection winchester 41 primers of standard utilization. Winchester ensures diligently-managed weights of primer mixtures, regularity in sizing and quality, precise measurements and tolerances for anvil heights and stability in extremes of temperatures and humidity.