Winchester NATO-Spec Military Primers forty one are precisely the same primers Employed in the Lake Town five.56mm ammunition. These primers are created to exacting technical specs for shot to shot regularity. All primers winchester 41 primers are continually and rigorously examined for consistency and sensitivity at temperatures and problems significantly further than the variety of usual utilization. Winchester guarantees very carefully-controlled weights of primer mixtures, consistency in measurement and excellent, precise measurements and tolerances for anvil heights and steadiness in extremes of temperatures and humidity.