Winchester NATO-Spec Armed service Primers 41 are exactly the same primers Utilized in the Lake Town five.56mm ammunition. These primers are constructed to exacting requirements for shot to shot regularity. All primers are constantly and rigorously tested for consistency and sensitivity at winchester 41 primers temperatures and situations significantly further than the selection of standard utilization. Winchester guarantees meticulously-controlled weights of primer mixtures, consistency in size and high quality, precise measurements and tolerances for anvil heights and steadiness in extremes of temperatures and humidity.