[ithacaartist]

Let's see if I understand...
The semi-auto's bolt is in place, closed and locking the breech, when the trigger is pulled to release the firing pin, which ignites the primer, firing the round--which sends the block and fp back together. The firing pin is engaged by the sear and retained until the trigger is pulled again; the block is pushed forward, back into battery by the recoil springs, picking up and chambering the next round from the mag.
I'm trying to visualize the sequence for full auto, and what you've described reminds me of a slam-fire, but controlled. How do the firing pin and block relate to each other mechanically in the full auto? Are they locked together somehow on the way forward?
Don't full autos also have a third position of the safety switch for full auto? (I'm figuring that the switch would cause the action to bypass the disconnect, and keep on cycling and firing as long as the trigger is held.)