The Browning Sabot Express Invector Plus Choke Tube fits 12 gauge shotguns with a Rifled Choke size. Both standard invector and invector plus tubes are available in chokes
ranging from cylinder to extra full. There is a longer choke taper inside
an invector plus choke tube which produces patterns with excellent uniform
densities. All Browning tubes are set to industry constriction standards
and have an excellent patterning. They are constructed of highly polished,
17-4 stainless steel for the ultimate in performance and durability.