Winchester NATO-Spec Armed forces Primers 41 are exactly the same primers Utilized in the Lake Town five.56mm ammunition. These primers are built to exacting specs for shot to shot regularity. All primers are regularly and rigorously analyzed for regularity and sensitivity at temperatures and circumstances much over and above the number of normal usage. Winchester guarantees cautiously-controlled weights of primer winchester 41 primers mixtures, consistency in dimension and top quality, precise measurements and tolerances for anvil heights and balance in extremes of temperatures and humidity.