Briley Browning Invector Plus Flush Black Oxide Choke 12 Gauge Cylinder .000. These Choke Tubes by Briley feature a longer parallel section with a more gradual taper allowing the constriction of the throat to be much more precise than with flush choke tubes. This Briley Choke Tube for Browning Invector+ provides more uniformity in the constriction of the throat and as such is a better choice for load densities and speeds as well as protecting the external finish of the gun. Try Briley Choke Tubes you'll be glad you did Specifications for Briley Browning Invector Plus Flush Choke Tube: Manufacturer: Briley Gauge: 12 Choke Tube System: Browning Invector Plus (+) Gun Make: Browning Package Contents: Briley Browning Invector Plus Flush Choke Tube Briley INPFB12CYL: Browning Invector Plus Flush Black Oxide Choke 12 Gauge Cylinder .000