Briley Browning Invector Extended Choke 12 Gauge Improved Modified .025. Briley Choke Tubes are designed for the shooter that likes longer shots and choke tubes for the Invector pattern are a perfect fit for any shooter. They are made out of high-quality steel to ensure that the shooter's shot is not flinched or diminished in quality. Another Briley advantage is the life that is extended from the shooter's side of the choke tube. Another advantage is the concentric nature of the choke with the constriction type of Briley - Longer tubes are always better for field use. Specifications for Briley Browning Invector Extended Choke Tube: Manufacturer: Briley Gauge: 12 Choke Tube System: Browning Invector (Standard) Gun Make: Browning Package Contents: Briley Browning Invector Extended Choke Tube Briley INVX212IM: Browning Invector Extended Choke 12 Gauge Improved Modified .025