When you need to purchase replacement parts for your Beretta Shotguns, its always best to trust only factory OEM products. The Beretta flush fit Mobil choke systems are sold caliber specific in 12g, 20g, 28g, and .410g and also sold in a variety of constrictions to get you the best results. Cylinder, Skeet EU, Improved Cylinder, Modified, Improved Modified, and Full, all easily installed or removed with the Beretta Choke tool. The Beretta 12g Mobil choke is made from stainless steel and fits Beretta Silver Pigeon I (field models), A300 Outlander, 687 (field models), Some 391 Models. The Beretta 12g Mobil choke is easily identified by the laser etched indentification on the side of the choke so as not to install the incorrect choke.