Here is how: when the gun's trigger is pulled, the disconnector does indeed lower the trigger bar below the end of the striker because the curved end of the trigger bar causes it to go down (which it must do to allow the striker tab to slip by the trigger bar and fire): however, the rest of what you posted is wrong.
As the slide moves out of battery, the lip on the disconnector is bumped inward by an edge on the slide specifically designed to move it. This is necessary to allow the trigger bar to pop back up in the path of the striker so it can catch it on the return stroke. Think about it: if it did not, the trigger could never return to the front because it is the striker spring which pulls AGAINST the rearward pull of the trigger bar spring to force the trigger to return to the front. This is the reason striker springs and trigger springs are adjusted as a set to get good trigger return. Without the striker engaging the trigger bar tab, the trigger would never reset.
So, as the slide moves out of battery (the disconnector gets bumped over), the trigger bar tab pops up again and catches the striker foot as the slide comes forward. If the trigger is still held back (as it will be as the slide cycles after firing) the slide returns to battery with the striker at "full cock" position and the trigger bar is disabling the firing pin safety because it is in firing position.
How could the striker get past the trigger bar and fire at that point? Easy. take the slide off your glock. Gently push the lip of the disconnector over to let the trigger bar pop up. Then gently apply downforce to the top of the trigger bar at the rear and see how much it takes to push it down: NOT MUCH. Look at how the trigger bar spring is mounted: nearly all the force is front to rear, not much pulling upward so it is easy to push the trigger bar down at the rear.
Where could that down force come from? Simple: the strong forward pull of the striker spring (at the striker foot) on the "sear tab" of the trigger bar. If the angle of that sear tab face gets slightly positive, the forward pull of the striker will also push slightly downward. Adjust the angle and you could make the striker "pull past" the trigger bar tab when the striker spring force gets to maximum as the slide goes into battery. Once that trigger bar was pushed down it would drop to it's "low" position and the striker would fly right by.
As the slide moves out of battery, the lip on the disconnector is bumped inward by an edge on the slide specifically designed to move it. This is necessary to allow the trigger bar to pop back up in the path of the striker so it can catch it on the return stroke. Think about it: if it did not, the trigger could never return to the front because it is the striker spring which pulls AGAINST the rearward pull of the trigger bar spring to force the trigger to return to the front. This is the reason striker springs and trigger springs are adjusted as a set to get good trigger return. Without the striker engaging the trigger bar tab, the trigger would never reset.
So, as the slide moves out of battery (the disconnector gets bumped over), the trigger bar tab pops up again and catches the striker foot as the slide comes forward. If the trigger is still held back (as it will be as the slide cycles after firing) the slide returns to battery with the striker at "full cock" position and the trigger bar is disabling the firing pin safety because it is in firing position.
How could the striker get past the trigger bar and fire at that point? Easy. take the slide off your glock. Gently push the lip of the disconnector over to let the trigger bar pop up. Then gently apply downforce to the top of the trigger bar at the rear and see how much it takes to push it down: NOT MUCH. Look at how the trigger bar spring is mounted: nearly all the force is front to rear, not much pulling upward so it is easy to push the trigger bar down at the rear.
Where could that down force come from? Simple: the strong forward pull of the striker spring (at the striker foot) on the "sear tab" of the trigger bar. If the angle of that sear tab face gets slightly positive, the forward pull of the striker will also push slightly downward. Adjust the angle and you could make the striker "pull past" the trigger bar tab when the striker spring force gets to maximum as the slide goes into battery. Once that trigger bar was pushed down it would drop to it's "low" position and the striker would fly right by.



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