Fits Beretta Silver Pigeon I (field models), A300 Outlander, 687 (field models), Some 391 Models These Competition chokes can be used on all Mobilchoke barrels. Made of high quality steel, they are of a great stress resistance due to heat treatments. They 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. These chokes are for 12 gauge shotguns only.