Briley Browning Invector Spectrum Black Oxide Ported Choke 12 Gauge Light Modified .015. Briley Choke Tubes are highly polished and have a long history of quality performance. Whether you are a shooter who likes to shoot for fun or shoot for duty the Briley Choke Tube is the right choice for you. This choke features a long parallel section in the choke which allows the release of significantly more shot than a choke tube without much increase in the pressure required. This choke will also throw a denser and more accurate pattern than a choke tube with a shorter parallel section. With a powerful combination of a diamond cut and beading a convex shaped end which funnels the shot down into the waiting hands of the shooter. The longer octagon shaped end which is parallel with the bore throwing more pellets on target than a conventional choke tube. The end of the choke tube is beveled to prevent contact with the breech plug. When you pull the choke out the breech is still open allowing the release of even more shot. The end of the choke tube is also conditioned to stop any side concussion that might be produced. After shooting let the Briley Browning Invector Choke Tube cool until the constrictions of the choke tube are no longer felt. Specifications for Briley Browning Invector Spectrum Ported Choke Tube: Manufacturer: Briley Gauge: 12 Choke Tube System: Browning Invector (Standard) Gun Make: Browning Package Contents: Briley Browning Invector Spectrum Ported Choke Tube Briley INVSBP12LM: Browning Invector Spectrum Black Oxide Ported Choke 12 Gauge Light Modified .015