The 20 Gauge Invector Plus Midas Extended Choke Tubes extend beyond the end of the barrel for easy removal and installation. They are tough with their stainless steel construction with black oxide finish and laser-etched gold accent band. If you are looking to upgrade from flush mount Invector-Plus tubes, this is an excellent tube to do it with. Performance and practicality meet here. Minimum gap geometry plus high resolution RMS finish reduces plastic buildup in the bore. It features Invector Plus long taper choke tube technology. This choke tube is made for barrels designed as 20 gauge Invector Plus only.