sometimes smiths that are not familure with model 12s measure the chamber of a dismounted barrel and come up with a short chamber, and lengthen it... not realizing that the chamber ring still in the receiver is part of the chamber on a model 12....you now have a standard field gun with a 3in chamber...could now also have a step after the chamber ring...if the smith decided to polished the chamber after lengthening it, which will have your hulls sticking on the step instead of extracting and ejecting.....
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always ask a smith if he is familure with model 12s B4 letting him work on your gun..............as model 12s are easy to mess up if the smiths a doofus.....
