Jebs Choke Tubes Upland and Windshooting 20 Gauge Choke Tube Beretta A-400 Optima H.P. .570 Full Choke Upland Tube Matte Stainless JPC - 20H2/570. These Choke Tubes built by the experts at Jebs Choke Tubes are made out of 17-4 stainless steel that's...