B. The trigger is depressed releasing the hammer to fire the cartridge.
C. With the trigger still depressed, the slide and bolt have cycled rearward forcing the hammer to engage the secondary sear which had previously moved forward slightly as the slide unlocked the bolt and moved rearward.
D. The slide and bolt move forward under recoil spring pressure. Just before the slide stops it makes contact with the tripping lever, forcing it forward. As the tripping lever pivots the disconnector forces the secondary sear rearward and releases the hammer to fire another cartridge.
E. The trigger is released allowing the hammer to engage the trigger sear. The firer has only to depress the trigger to resume automatic fire.
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