Beretta Optima Choke Tubes are the latest news in terms of chokes and the best in terms of performance, resistance and reliabilty. The Beretta Optima Choke Plus has an modified extended constriction. Thanks to an elongated cone, Optima choke Plus guaranties an excellent shot pattern. The new shape improves resistance to the pressure and speed created by 3.5 inch cartridges with steel shot. The special heat treatment assures a high level of durability. Extended Version is 3/4 inch (20mm).