The longer choke taper inside Browning Invector-Plus choke tubes is made for use with back-bored barrels to produce excellent patterns with excellent uniform densities under all conditions. It produces excellent patterns with uniform densities. All Browning tubes are set to industry constriciton standards. Flush fit does not extend beyond the end of the barrel except X-Full Turkey and X-Full Trap models. It is constructed of highly polished 17-4 stainless steel for the ultimate performance and durability.