ZPV Headspace Gauge Field, GO, NO-GO Set 7.62x39

This ZPV Headspace Gauge Field Set is necessary when finish chambering a barrel or when checking the chamber of a used gun to be sure the headspace dimensions are within safe limits. A Go Gauge and a No Go Gauge are required to properly headspace a barrel. Field gauges are used to determine if a gun is safe to fire.Field gauge (slightly longer than "NO-GO"), is used in the field to indicate the absolute maximum safe headspace. Field gauge is 0.1mm(0,004inch) longer than a NO-GO gauge.Go Gauges r