5.7 x 28 Firing Pin Indent Gauge

These PTG Firing Pin Indent Gauges are made to minimum chamber specs and are used for checking firing pin protrusion into primer. Insert is measured before and after striking. Insert bore dimensions are 0.227” x 0.400” +0.001”. May also be used as a GO Headspace Gauge. Required: See Firing Pin Copper Crusher Indent Cylinders below.