Re: Carbine
I am not exactly sure of the physical dimension of the rearward travel of the barrel assembly to cycle the action (without going downstairs and measuring the action, I would guess about 3/8"). The barrel/receiver assembly is locked with the toggle assembly in recoil until the toggle knobs contact the frame ramp. At that point, the toggle knobs move upward, breaking the straight line of the breechblock/forward toggle link/rear toggle link train. Now the toggle train is no longer "locked" and the inertia of the breechblock will cause it to move away from the barrel and extract the spent cartridge case.
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