Browning Invector-DS Choke Tube, 20, LMOD Features: - Fit flush with the end of the barrel but are longer than competitors tubes - 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: 20 - Choke Pattern Percentage: 45%-55% - Weight: 4. 8 oz