12 gauge Rizzini chokes. Twelve gauge Rizzinis leave Marcheno with one of three bore profiles — XL Bore, Plus, or standard Rizzini — and each takes its own tube. A Plus tube will not seat or pattern correctly in an XL Bore barrel, so start by matching the profile your barrels are cut for.
The profile is stamped on the tube itself and listed on your gun’s spec card. Once you have it, choose flush or extended and your constriction on the product page. Nominal bore is .729″ (18.5 mm).
