Jones Underlever - A lever, mounted to the underside of the receiver of a break-open gun, extending half way around the trigger guard and ending in a knob the shooter can grasp. When the lever is turned 90 degrees to the right, a pair of tapered, opposing lugs move out of mating bites in the barrel lumps, allowing the barrels to drop open on the hingepin. Developed by Henry Jones of Birmingham, England in 1859. While not the fastest-opening design for the lockup of a break-open gun, being manually operated both for opening and closing, it is amongst the simplest, strongest and most durable.
A Jones underlever in the midway position, showing the locking cams partially closed.
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