The L-shaped trigger bar is not spring loaded, but the trigger is spring loaded, and the the shorter leg of the L-bar is inserted between the "sleeping U" at the tip of the trigger. When the trigger is released, it returns to its forward position under the force of the trigger spring, and trigger "sleeping U" pushes the shorter leg of L-bar up, so the longer leg of the L-bar goes outward, sear head (disconnector) now has empty space to return to its forward position under the L-bar's long leg again.
So, in this application, the trigger controls the sear via the disconnector. By turning disconnector "on" and "off", semi-auto was enforced -- you have to release the trigger to reset the disconnector to fire again.
Pistol is like wristwatch. Every gear has been standardized, implemented in a little different ways, but virtually under the same principals.
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