Dave,
I had one Tobin that was not off the face due to the frame distortion-my 16, which was my last Tobin. The five previous all were.
A friend owns the last 12 gauge I owned, a gun that came from out own prankster John Mann. It was the pyro version Tobin, and the gun had a shim put on by Mike Orlen. It didnt appear to have been used much, but, it needed the fix. John didnt know it needed to be fixed, the prankster notation comes from the story about the Amish goat herd with the two high grade LC Smiths that he posted, and taught a few regulars here a stinging lesson about naked greed.

Best,
Ted