The Carlson's Choke Tubes 40021 is a precision-engineered replacement choke tube designed for Remington 20 gauge shotguns with rifled constriction for enhanced accuracy with slugs.Carlson's Choke Tubes Model 40021Remington Rem Choke configuration for proper fit20 gauge rifled choke with .730" constriction diameter304 stainless steel construction for durability and corrosion resistanceMatte black finish for reduced glareSingle choke tube includedIdeal for hunters and shooters who need reliable slug performance from their Remington 20 gauge shotgun this rifled choke tube delivers consistent accuracy and long-lasting performance in the field.