Connected to the midpoint of the rotating lever is a long metal arm. The motion of the lever causes this arm to be forced rearward, pushing the entire breech mechanism with it. The rear end of this mechanism presses on the cam, forcing the bolt upward and unlocking it. Continued motion slides the bolt rearward against the spring, while also operating the mechanism that feeds the ammunition belt and readies the next round. When it reaches the end of its motion the spring pushes everything forward again, carrying the new bullet with it and seating it in the barrel before locking again.