Optimachoke Plus the best in term of performance, resistance and reliability. Thanks to an elongated cone, Optimachoke Plus guaranties an excellent shot pattern. The new shape improves resistance to the pressure and speed created by 3.5” cartridges with steel shot. The special heat treatment assures a high level of durability. Extended Version ~3/4" (20mm). These choke tubes will only fit 12 Gauge Optimachoke Plus shotguns,
How can I tell which choke tubes fit in my shotgun?