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The full auto carrier has a cam on the right side that presses down and forward on the upper arm of the auto sear. This happens every time the bolt closes, but if the selector is set for semi-auto fire, the hammer is being held by the rear semi auto sear engaging the rear hammer hook and nothing happens.
But if the selector is set for full auto fire, the rear sear is disengaged and the hammer is being held by the auto sear engaging the front notch in the hammer, so when the carrier cams down the auto sear the hammer falls.
Like all other such actions, the carrier will not engage the auto sear until it has already locked the bolt, so that the hammer will not fall unless/until the bolt is fully locked. Contrary to what someone wrote on another site, neither the AK or any other full auto rifle depends on hammer follow-down to fire full auto.
The semi auto versions have a different safety (safe-semi only), a different hammer, no auto sear and no hole for its pin, no auto sear spring, and a carrier without the cam.
Jim
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