One thing that can cause the unhooking slide to stick (apart from dirt or grime) is over tightening of the slide retaining screw. This is the very small screw in the side of the trigger plate on the front.
Not saying that this was the issue with your gun. Just mentioning it.
If someone buys a new gun from a dealer or otehr party that does not know better, who knows. They could have done some taking apart and "cleaning" before putting it on the used gun rack. Overtightening the screw when putting back together. Then the new owner is stuck wondering why the barrels won't come off.
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B. Dudley
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