Jebs Choke Tubes Waterfowl 12 Gauge Choke Tube Beretta A-400 Optima H.P. .690 Improved/Modified Upland Tube Matte Stainless JPC - 12H2/690. P. Choke Tube. Jebs Choke Tubes crafted each of these from 17-4 HSS which makes them more rugged reliable and...