Carlson's Choke Tubes Winchester Flush Mount Choke Tube 20 Gauge Full. These Choke Tubes built by Carlson's Choke Tubes are ideal for use with lead shot in all constriction sizes. The 20 Gauge Flush Mount Choke for Winchester by Carlson's is the perfect tool for any shooter whose grouping patterns are lacking in tightness. This Carlson's Shotgun Choke has an end that is knurled for easy removal and has a constriction type etched on the side for reference in the field. Specifications for Carlson's Winchester Flush Mount Choke Tubes 20 Gauge: Manufacturer: Carlson's Choke Tubes Color: Stainless Fabric/Material: 17-4 Stainless Steel Gauge: 20 Choke Tube System: Mossberg Accu-Choke Winchester Choke Browning Invector (Standard) Gun Make: Winchester Mossberg Browning Quantity: 1 Additional Features: Non-Ported Condition: New Country of Origin: USA Features of Carlson's Winchester Flush Mount Choke for 20 Gauge: Interchangeable with Winchester Mossberg Browning Invector Weatherby and Savage 12 gauge & 20 gauge shotguns Knurled end for simple installation Constriction is marked on the side for reference Package Contents: Carlson's 20 Gauge Winchester Flush Mount Choke Tubes Carlson's Choke Tubes Winchester Flush Mount Choke Tube 20 Gauge Full 10104