I would return the sight to the center position and shoot to see if the adjustment was purposeful, or you could adjust the rear sight into center position, and use one of those laser cartridges to bore sight it. Place the slide on the table somewhere and then look down the sights. If the laser point meets your sight picture, the rear sight was probably reinserted incorrectly, or has slipped by itself. I have a glock where I can move the rear sight by hand, with a lot of force, but still. The way Glocks are made, I see no real way for it to be that much off.
Also, take a look at the right side on the rear sight and see how many dashes you have on the side. They represent the height of the rear sight, and how your point of aim will compare to point of impact. Long dash is point of aim, short dash(es) represent point of impact. Just so there is less surprise if you seem to hit high or low.
Edit: never mind, I see you have a single long dash, so it should hit where you aim.
Also, take a look at the right side on the rear sight and see how many dashes you have on the side. They represent the height of the rear sight, and how your point of aim will compare to point of impact. Long dash is point of aim, short dash(es) represent point of impact. Just so there is less surprise if you seem to hit high or low.
Edit: never mind, I see you have a single long dash, so it should hit where you aim.
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