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My in-house Glock Advanced Armorer bets that you bent the rear of the trigger bar that contacts the firing pin lug.
When you last had your gun apart, you pushed the trigger forward before putting the slide on. Pushing the trigger forward raises the rear of the trigger bar. With the trigger bar raised, forcing the slide on could result in bending the rear of the trigger bar downward, which would reduce the engagement surface with the firing pin lug - not a good thing.
Glock will take care of you.
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