Carlson's Choke Tubes Remington 20 Gauge Replacement Choke Tube Cylinder. Manufactured from 17-4 heat treated stainless steel these Shotgun Chokes made by Carlson's Choke Tubes are built to be durable and long lasting. The Carlson's Remington Flush Mount may be used with lead shot on any constrictions. Carlson's Shotgun Chokes are for sale and available for purchase in our online store Features of Carlson's Flush Mount Choke Tube for 20 Gauge Remington: Tightens shot patterns Efficient at long or short distances Package Contents: Carlson's Remington 20 Gauge Flush Mount Replacement Choke Tubes Carlson's Choke Tubes Remington 20 Gauge Replacement Choke Tube Cylinder 10207