A. FEEDING THE ROUND
The barrel assembly, breech mechanism, and tray are moving forward in counterrecoil. The breech block is held down by the extractors, and the rammer shoe is held back by the tray catch lever. The star wheels are released, the catch heads of the catch mechanisms having been tripped by the rammer tray pawls. The feed pawls, due to the action of the tray guides, are pressing the rounds down. This forces the bottom round between the star wheels and onto the tray.
B. COCKING THE RAMMER
The barrel assembly, breech mechanism, and tray are still moving forward in counterrecoil and have almost reached battery position. The live round is now on the tray with its base in the slots of the rammer levers. The rammer shoe is being held back by the tray catch lever, and as the tray moves forward, the rammer spring is compressed, cocking the rammer. The trigger catch lever is held down by the trigger mechanism, and the loader catch lever is held down by the rounds in the loader. This leaves only the tray catch lever holding the rammer shoe.