Originally Posted By: Keith E. Carlson
If it has 26 inch barrels, it is almost surely IC/Mod
If 28 inch, Mod/Full.
best way is to pattern it, tho.


That is typically true; however I have a 20ga 311 with 28" barrels which I'm pretty sure are unaltered, and they that measure IC/IM. If you really care, find a good gauge or pattern it.

Last edited by Fin2Feather; 08/08/08 10:33 AM.

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