The Carlson's Choke Tubes 07456 Delta Waterfowl Extended Choke for Winchester 20 Gauge Long Range is built for extended pattern density at 40 yards and beyond, delivering the best results with steel shot through a longer parallel section that reduces flyers while producing denser patterns. Crafted from 17-4 stainless steel with a blue finish and a knurled extension, this extended range choke tube threads 3/4" outside the barrel to help protect the barrel from steel shot wear during extended use, while allowing the use of larger steel shot in tighter constrictions. The design supports precise long-range performance by maintaining a consistent bore alignment and consistent choke effect, and Carlson's offers a lifetime warranty on these choke tubes. All steel shot sizes can be used in the close and mid-range tubes, with a caution to avoid steel faster than 1550 FPS or steel shot sizes larger than BB through the Long Range choke. This model is compatible with Winchester Browning Invector, Mossberg 500, Weatherby pre-1993, Ruger Red Label, and Winchester SX-2/SX-3 & SXP using Browning Invector Plus tubes, making it a versatile choice for waterfowl and upland hunters seeking improved long-range performance with steel.