Briley Beretta Optima Plus Helix Choke 12 Gauge Light Full .030. This Shotgun Choke made by Briley Helix Technology uses a patented elastomeric material that is said to provide a material that lasts much longer than the other brands. The Briley Helix Beretta Optima Shotgun Choke Tube is a one piece unit that affixes to the barrel so changing it is very easy. This Briley Helix Beretta Shotgun Choke Tube requires a threaded muzzle thread for installation but can be easily removed with a simple thumb twist. Specifications for Briley Beretta Optima Plus Helix Choke Tube: Manufacturer: Briley Gauge: 12 Choke Tube System: Beretta Optima Plus Gun Make: Beretta Package Contents: Briley Beretta Optima Plus Helix Choke Tube Briley BOPH12LF: Beretta Optima Plus Helix Choke 12 Gauge Light Full .030