C. RAMMING THE ROUND |
The parts that were moving forward in counterrecoil have now reached battery position. The beveled cam on the under side of the tray has ridden over the forward end of the rocker arm, tripping the tray catch lever, thus allowing the rammer shoe and levers to be thrown forward by the action of the rammer spring. As the rammer levers neared the forward limit of their travel, they were spread apart by the cam slots of the tray through which they extend. This allows the round to continue its travel and be thrown into the barrel chamber.
D. CLOSING THE BREECH
The round is completely in the chamber and the closing spring is raising the breech block to the closed position. The breech block is free to rise, because the extractors were unhooked from the block by the base of the round as it was thrown into the chamber. As the block rises, pressure of the cam on the left inner crank is removed from the outer cocking lever. The firing pin is being held back only by the inner cocking lever which is prevented from moving by the sear.