Winchester NATO-Spec Navy Primers 41 are a similar primers Utilized in the Lake City 5.56mm ammunition. These primers are created to exacting requirements for shot to shot consistency. All primers are continually and rigorously analyzed for regularity and sensitivity at temperatures and ailments much further than the number of usual usage. Winchester winchester 41 primers ensures carefully-controlled weights of primer mixtures, regularity in size and top quality, precise measurements and tolerances for anvil heights and balance in extremes of temperatures and humidity.