Carlson's Winchester 20ga waterfowl mid-range and long range choke tube set. Our waterfowl extended choke tubes are manufactured from 17-4 stainless steel and designed to throw tighter and denser patterns than conventional choke tubes. These choke tubes feature a 25% longer parallel section in the choke, thus throwing more consistent patterns. Each choke tube is knurled on the end to allow for quick and easy removal. Each choke tube has the constriction and size laser marked on the end and body for easy reference. Steel shot may be used through these choke tubes with exceptional results. Do not shoot steel shot larger than BB or any steel load faster than 1550 FPS through the long range constriction. Loads that exceed this size and speed should be used with the mid range choke tube. These chokes are backed by Carlson's lifetime warranty. Mid range extended steel shot choke tubes - for those situations where you are shooting 25 to 40 yards. LONG range steel shot choke tubes - for taking shots 40 yards and up. Our best patterning long range choke tube.