Thanks, I was hoping that was somehow a code to give me a chamber length. Seems my newer 16's are marked 70mm but the older ones are unmarked. I have some Ely and RST 21/2 " Shells, and load short shells for my older guns, so I won't alter it. Someone put a Polychoke on it so its just a shooter, and kind of rough anyway. Perfect rabbit and squirrel gun after deer season.
