Code Black Duck is a unique design from Patternmaster that ensures quicker release of gas resulting in reduced pressure and recoil that effectively separates the wad faster and produces an even more symmetric shot pattern. Code Black tubes have been coated with a bronze-titanium blend to better withstand heat and corrosion. Tubes are only available in a non-reflictive Bronze color that blends well with fall camo and wetland patterns. Tube will extend out the end of your barrel one inch. Expect full patterns with 3” and 2 3/4” shells, modified patterns with 3 1/2” shells. Patterns vary with shot sizes, larger shot like #2s, BB BBB, and T shot will pattern tighter. Small shot such as #4s and #5s will throw a more open pattern. Once again, Patternmaster has gone to the limits to make a top-of-the-line shooting accessory for the extreme hunting experience. Warning: Mass Casualities will happen.