Briley Browning Invector Spectrum Black Oxide Choke 12 Gauge Cylinder .000. Briley Invector Choke tubes provide the performance of a Briley Modified SS or Steel Choke tube. These chokes give excellent patterns and carry a lifetime warranty. Briley invector choke tubes also tend to cycle easier than flush style chokes due to a design feature that reduces the amount of recoil felt by the shooter. Briley invector tubes also tend to cycle easier because the constrictions of the constrictions cause less flyers. Thus less wind knots less pellet deformation and less pellet pass-throughs resulting in greater accuracy over a longer period of time. Specifications for Briley Browning Invector Spectrum Choke Tube: Manufacturer: Briley Gauge: 12 Choke Tube System: Browning Invector (Standard) Gun Make: Browning Package Contents: Briley Browning Invector Spectrum Choke Tube Briley INVSB12CYL: Browning Invector Spectrum Black Oxide Choke 12 Gauge Cylinder .000