These Competition chokes can be used on all Mobilchoke barrels. Made of high-quality steel, they are of 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-.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.