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Had the same thing happen to me. Grab a ramrod or brass cleaning rod, put it into the cylinder up against the stuck casing (cylinder swung open), and smack it hard. Hit the rod with a mallet if you have to. It'll come free.
Then take cleaning patches soaked in oil and lubricate the inside of every chamber on the cylinder.
Geez. First thing i did was take mine off, but wow. Typical Turkish pot metal. Frightening thing is i've seen broken Girsan receivers made out of the same stuff.