Made of steel and featuring constrictions that are easy to identify with unique colored bands, these Beretta factory original 12 gauge extended choke tubes are of a great stress resistance due to heat treatments; These competition chokes can be used on all Mobilchoke barrels; fit Beretta Silver Pigeon I (field models), 687 (field models), A300 Outlander, and some 391 models; These competition choke tubes are subjected to a special coating that guarantees high protection to corrosion; They are extended by 25mm-0.98" and their external shape has been studied in order to guarantee installation and de-installation without specific tools; The end of the choke is identified by a colored alloy stripe for fast and easy indication of the constriction