Mine was loose enough that I had concerns about bullets striking the interior.
I carefully measured how much material needed to be removed to allow it to fully snug-up and have the locking pin engaged, then had my gunsmith turn it down by a bit less. I did final fitting using a sharpening stone to grind off a small amount of additional material (~0.0005"), then reblued the end.
It now fits perfectly, but only on one of my VZ-58s...