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Brownells & Carlson’s 3-Gun Extended Choke Tubes are specially made for 3-Gun contests, which consist of three tube options comprising Full, Improved Cylinder & Modified. This variety allows for the shooter to select the exact choke needed for each stage, quickly eliminating clay pigeons or hitting long-distance steel targets. The tubes are made from 1704 stainless steel and generate tighter and denser patterns than standard choke tubes. Each tube is knurled at the end to ensure fast and easy removal, while constriction and size are laser marked on the body and end for convenient reference. Do not use slugs, rifled slugs, or sabots in any choke constriction tighter than Improved Cylinder. It is recommended to pattern the shotgun choke tube with a particular shot shell load since different brands of ammunition produce varying patterns from the same choke tube. This choke carries a lifetime warranty from Brownells & Carlson's and is available in Choke Tube Sets for Remington 12 Gauge shotguns. While not typically used at 3-Gun events, steel shot can be used through these choke tubes with excellent results. Do not shoot steel shot more abundant than BB or any steel load faster than 1550 FPS through Full or Extra Full Constrictions.