Carlson's Extended Turkey Choke Tubes extend approximately 1 from the end of the barrel. They are manufactured from 17-4 heat treated stainless steel and have a matte blue finish. Our Extended Turkey Choke Tubes feature a 1.050 parallel section to produce the optimum pattern with your shotgun. *Note- No steel shot Larger than #4 may be used in our Turkey Choke Tubes. Winchester SX-P, SX-2, SX-3 & SX-4 use Browning Invector Plus Tubes--Order Browning Invector Plus for these model of shotguns.