My second 63 has the same vexing problem as the first. Both are from the seventies, first run. They will not go more than 12 rounds before binding and tightening up. Lube is not an issue. I discovered that the barrel on my present one was not faced off square with a gap of .006" on the left and less than . 0015 on the right. I spent yesterday afternoon carefully diamond filing and stoning the barrel face square and obtained a square face as uniform gap. Today I'll shoot it as see what happens.
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