I bought another 16 GA barrel from Corson's Barrels and fitted it to my M31. Now my full choke barrels sits in the locker while I use the Poly-Choke barrel. If you are not concerned with "collector originality" send the gun to poly-choke. Otherwise, be on the lookout for spare barrels. Of course, Briley's thinwall tubes may work as well.

If you reload, try cutting down the petals on the plastic wads, as the "bore scrubbed" shot should open up the pattern a bit. FWIW.

Mike Doerner