"clamp frame "gently" but firmly in a vise" and then firmly whack it with a hammer. Bad idea. After tearing down Ruger Mks for many years I can tell you there is no reason to clamp the frame in a vise. I just hold the frame in my hand and inch or so above a padded benchtop and tap the barrel with a plastic or rawhide mallet. If it requires more force than that then the reciever needs some fitting work.
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