Do you have a dial caliper? 20ga full choke should have an I.D. right around 0.587" - give or take a couple thousandths. Modified would be around 0.602" give or take. As for what chokes are available, IIRC they're Win-Choke chokes.
Do you have a dial caliper? 20ga full choke should have an I.D. right around 0.587" - give or take a couple thousandths. Modified would be around 0.602" give or take. As for what chokes are available, IIRC they're Win-Choke chokes.
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