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From what you describe, it sounds like you assembled the weapon wrong when you changed the slide stop. Put the small locking block pin in first, then the slide stop, then the trigger pin. Sounds like you have the slide stop spring on the top side of the locking block pin, which will put...

I would check to see that it locks back on empty mags by just inserting a mag and bring the slide back. If it doesn't lock back, I would look at the mag follower to make sure the part that engages the slide stop hasn't broke off. Could also be weak mag springs.