Bang Switch

From: various firearms forums.

The trigger on a firearm, especially when referred to in the context of safety and not firing the firearm at an inopportune moment

"If you don't want to blow a hole in your leg, then there's only one rule you need to remember - keep your booger hooker off the bang switch!"

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bang switch

The trigger of a firearm

"Trigger discipline" means keeping your booger hook off the bang switch.