I contacted Briley. FWIW Ithaca uses the standard Invector choke tubes. (Not the Invector Plus or DS). Kind of convenient that I can interchange tubes between my Citori 16ga and Ithaca Model 37 16g ...
My first post here in the 16ga. I have an Ithaca Model 37 in 16ga. It is a newer model made in Upper Sandusky, Ohio. I bought it a couple years ago when they were ending production of their 16ga. ...