Carlson's Choke Tubes Winchester 20 Gauge Delta Waterfowl 2 Pack MR & LR. This Choke Tube by the experts at Carlson's Choke Tubes features a 25percent longer parallel section in the choke leading to more consistent patterns. The Carlson's Waterfowl Choke Tubes Winchester 20GA 2 PK (MR & LR) Choke Tube is manufactured from 1704 stainless steel is knurled on the end to allow for quick and easy removal and has the constriction and size laser marked on the choke tube and the color cased body for easy reference. Steel shot may be used through this choke tube with exceptional results. Do not shoot steel shot larger than BB's through the Long Range Choke tube. Loads that exceed this size and speed should be used with the Mid Range Choke tube. Specifications for Carlson's Choke Tubes Winchester 20GA Delta Waterfowl 2-Pack Choke Tube: Manufacturer: Carlson's Choke Tubes Color: Black Fabric/Material: 17-4 Stainless Steel Gauge: 20 Choke Tube System: Mossberg Accu-Choke Winchester Choke Browning Invector (Standard) Choke Type: Mid Range/Long Range Diameter: 0.59 in 0.6 in Gun Make: Winchester Mossberg Browning Quantity: 2 Pack Additional Features: Non-Ported Included Accessories: Choke Wrench Country of Origin: USA Features Delta Waterfowl 20ga 2 PK (MR & LR): Winchester Package Contents: Carlson's Choke Tubes Winchester 20GA Delta Waterfowl 2-Pack Choke Tube wrench Carlson's Choke Tubes 07471: Winchester 20 Gauge Delta Waterfowl 2 Pack MR & LR