Winchester NATO-Spec Navy Primers forty one are the identical primers Employed in the Lake Town five.56mm ammunition. These primers are crafted to exacting technical specs for shot to shot regularity. All primers are regularly and rigorously analyzed for regularity and sensitivity at temperatures and disorders considerably outside of the range of regular usage. Winchester assures diligently-managed weights of primer mixtures, consistency in dimension and top quality, precise measurements winchester 41 primers and tolerances for anvil heights and steadiness in extremes of temperatures and humidity.