How much taper does a Greener bolt have & what prevents ir sticking??. When D M Lefever left the LAC & began building the New Cross Bolt gun he used a tapered bolt, but also inserted a stop screw from the opposite side to prevent it wedging in & binding. Anyone who has ever removed a tapered pin or a tool from the tailstock of a lathe will understand the value of this. I had always just assumed the Greener bolt was straight as were many of its copiers.

Miller/TN
I Didn't Say Everything I Said, Yogi Berra