fire-control lever

Murdock snicked his fire-control lever to full auto, then rose to a half crouch, H&K raised to his shoulder.

Then he pushed the fire-control lever onto automatic, stood, and with his would-be attacker less than ten feet away, let go a short, but nonetheless extravagant, burst of fire.

He swung his rifle up and began squeezing the trigger, remembering to first make sure that the fire-control lever was set forward for semiauto, and remembering his advice to Goodkin, that morning.