Check to see if the inner barrel is centered inside the outer barrel. Sometimes the outer barrel leaves too much space inside for the inner barrel to move around. Same with inner barrel inside the slide. Try cleaning the tightbore. Are you clamping the gun down during the accuracy test? Because the recoil characteristics changed when you put the metal slide on.
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"The Bird of Hermes is My Name, Eating My Wings to Make Me Tame."
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