Browning Invector-DS 16 Gauge Choke Tubes Mod. Proprietary differential banded gas seal eliminates residue build up and makes chokes easy to remove and install. Invector-DS tubes fit only Browning shotguns designed for Invector-DS and are not for use in shotguns showing Invector-Plus or Standard Invector on the barrel(s). Specifications for Browning Invector-DS 16 Gauge Choke Tubes: Manufacturer: Browning Color: Chrome Fabric/Material: Stainless Steel Gauge: 16 Choke Tube System: Browning Invector DS Gun Make: Browning Quantity: 1 Features of Browning Invector-DS 16 Gauge Choke Tubes: 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 Package Contents: Browning Invector-DS 16 Gauge Choke Tubes Browning 1133256: Invector Ds Choke16Mod