Invector-DS Choke Tube - Extends beyond end of barrel for easy removal and even tighter patterns - Proprietary differential banded gas seal eliminates residue build up and makes chokes easy to remove and install - Integrated spring suspension holds the seal tight, yet allows expansion against the barrel wall for a perfect fit and a smooth transition for the shot column entering the choke - Gas is controlled at the interface between choke and where it seats in the bore - From skeet to full choke, patterns tighten consistently and reliably Specifications: - Material: Nickel Chrome Moly - Color: Chrome - Pockets: Chrome - Choke Gauge: 12 - Extended - Improved Cylinder