The Carlsons Cremator Waterfowl Mid Range Ported Choke Tube for 20 ga Beretta/Benelli Mobil .597 combines the brands innovative Triple Shot Technology with a close mid and long range constriction to deliver dense, uniform patterns across all stages of waterfowl season. TST features three graduated rings in the choke taper that create a smoother transition from bore to constriction, reducing pellet deformation and flyers for tighter patterns at practical distances. This Cremator series imposes no size or speed restrictions with steel shot in any of the three constrictions, while offering the perks of an extended tube, including a 25% longer parallel section for increased density, wrench-less installation, quick removal, and enhanced muzzle protection. Available in ported or non-ported configurations, these tubes are precision-machined from heat-treated 17-4 stainless steel and proudly made in the U.S.A., backed by Carlsons lifetime warranty. The Cremator design is especially effective on all waterfowl species throughout the season, delivering consistent performance with steel shot when used within the noted constraint that Optima HP and Remington Pro Bore Long Range cannot be paired with steel larger than #2.