Standard in all Browning back-bored barrels. Invector Plus and back-boring
work together as a team. The longer choke taper inside an Invector Plus choke
tube - combined with back-boring - produces patterns with uniform densities.
Invector Plus tubes are for Browning's back-bored 12
gauge shotguns only, and are not intended for standard bored barrels.
Available in chokes Cylinder Bore, Skeet, Improved
Cylinder, Modified, Improved Modified, Full and Extra Full Trap/Turkey