Purchased the CZ 457 American combo from Bud’s. When first attempting to change barrels, the barrel would not budge, not even after completely removing the screws, almost as if it was welded in. CZ did a warranty repair and advised me that the rear magazine housing screw must be loosened before removing barrel. I tried, and was able to remove the barrel after loosening that screw. Why is it then, that in all videos, including CZ’s, others’ barrels easily come out without loosening that screw?

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