Browning extended invector ds 12ga choke tube light full FEATURES-12 gauge-Light full-Nickel chrome moly-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 Other Features: Longer than competitors' tubes knurled ends for sure grip brass alloy band seals tight to eliminate residue build-up