One of the most popular choke systems of all time. Longer length. Better taper designs. Superior patterns. Original equipment quality. Fits barrels designated for 20 gauge Invector-Plus only. Choose from a full selection of tubes and constrictions. Invector-Plus tubes are available in constrictions ranging from Cylinder to Extra-Full. The longer choke taper inside Invector-Plus choke tubes is made for use with back-bored barrels to produce excellent patterns with excellent uniform densities under all conditions. Features: All Browning tubes are set to industry constriction standards Flush fit does not extend beyond the end of the barrel Constructed of highly polished, 17-4 stainless steel for the ultimate in performance and durability Invector-Plus tubes are available in constrictions ranging from cylinder to extra-full Produces excellent patterns with uniform densities Flush fit tubes do not extend beyond end of barrel