The Carlson's Cremator Ported Choke Tube for 20 ga. Browning Invector Plus MR, LR 2-pack delivers unmatched long- and mid-range performance with Carlsons innovative Triple Shot Technology (TST), featuring three graduated rings in the taper that create a smoother transition from bore to constriction for tighter, denser patterns and reduced pellet deformation and flyers across waterfowl seasons. This extended choke design adds a 25% longer parallel section for improved density, while offering a choice of ported or non-ported configurations to manage recoil and muzzle rise without compromising pattern consistency. Precision-machined from heat-treated 17-4 stainless steel in the U.S.A., these Cremator tubes provide wrench-less installation, quick removal, and enhanced muzzle protection, all backed by a lifetime warranty. The system imposes no size or speed restrictions with steel shot in any of the three constrictions, making it versatile for varied quarry and load selections while maintaining reliable performance with Browning Invector Plus MR barrels. As a practical note, Optima HP and Remington Pro Bore Long Range cannot be used with any steel shot larger than #2, ensuring safe, reliable usage with appropriate loads.