Fits CZ USA 12 Gauge CZ 1012; Goose Hunt - Patternmaster's Code Black Goose tubes will extend out the end of your barrel 1 1/2 inches; For best results, Ballistic Performance, LLC, recommends ammunition velocities below 1550fps; Not to be used with Slug ammunition; Unique Style - The difference between the Code Black Duck and Code Black Goose is the length of the tube sticking out of the barrel (Duck=1" vs Goose=1 1/2"); The added length is to accommodate a 3 1/2" shell and still achieve a Full pattern; Stud Ring - You will see a pattern similar to a "Full" constriction choke on paper, but because of the patented "stud ring" inside the tube, there is a much shorter shot string; This 12 Gauge tube for Goose hunt comes in a bronze color and is ported; Construction - The choke tube from the Code Black series is crafted out of American-made, titanium-infused 17-4ph stainless steel and undergoes heat treatment to achieve optimal performance levels; Brings Trophies - The shorter shot string will allow more shots on target all at once, so your down-range energy is sure to kill instead of a cripple; Code Black Goose tube has an effective range out to 70 yards