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FX Crown MkII Barrel Removal

For an FX Crown MkII, is it necessary to loosen and/or remove the screw in the top of the receiver in the picatinny rail every time before removing the barrel? I have seen this called the blanking set screw. In some videos, this screw is removed and in others only the 4 screws on the side of the receiver are removed with the advantage that the scope remains in place. Please advise the best practice as this is my 1st PCP. Thanks