These are Remington factory replacement shotgun barrels. FeaturesCantilever Rem Choke deer barrels are supplied with improved cylinder and extended rifled choke tubes.Rifle-sighted Rem Choke deer barrels are supplied with rifled and improved cylinder choke tubes.1100 Steel Shot Barrels includes a Full choke and is designed for use with 2-3/4" or 3" Magnum steel or lead loads when used on Magnum receivers and 2-3/4" or 3" Magnum steel or 2-3/4" lead shotshells when used on non-magnum receivers. Remington Full Choke may be labeled Steel Shot but it is combatable with Steel or Lead Shot.1100 Standard contour Skeet barrel supplied with Skeet and Improved Skeet choke tubes onlyLT-20, 20 gauge 2-3/4" lightweight barrels will not fit pre-1977 20 gauge lightweight or standard 20 gauge Model 1100 shotguns