<blockquote class='ipsBlockquote'data-author="HotRodZilla" data-cid="1361749" data-time="1492050987"><p>A friend of mine who used to shoot USPSA has one. Used to shoot a compensated Glock 9mm, I think. One day he was shooting a stage and came to a sudden jolting stop. That thing pulsed him, and he said it hurt like Hell. His doc said he thought the PM was picking up the pulses from the gun, thought something was wrong, and tried to fix it. He continued shooting for a while, and got popped again a few months later.<br />
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That was the last time I saw him on a pistol range. Now he shoots Trap and Sporting Clays. Hasn't had an issue in 5 years.</p></blockquote>
Sounds like a lead issue. They're not supposed to fire unless a certain rate has been reached. When the leads have breaks in them movement often triggers a shock. The support groups are filled with people with PSTD from those rings going off. The interference of the welder is going to have a higher hertz and set it off.