Winchester NATO-Spec Armed service Primers 41 are exactly the same primers Utilized in the Lake Town 5.56mm ammunition. These primers are built to exacting requirements for shot to shot regularity. All primers are frequently and rigorously examined for regularity and sensitivity at temperatures and circumstances significantly further than the array of usual use. Winchester ensures very carefully-managed weights of primer mixtures, consistency in dimension and good quality, precise measurements and tolerances for anvil heights and steadiness winchester 41 primers in extremes of temperatures and humidity.