Carlson's Choke Tubes Tactical Breecher Muzzle Brake Ber/Ben Mobil Cylinder. The Extra Full constriction can be used with all Hevi-Shot and lead loads (but is not to be used with slugs cannot be used with any Steel shot larger than #2 or with any Steel shot faster than 1550FPS). The Extra Full constriction is also an excellent choice for hunters using larger shot sizes for coyotes wild hogs and deer. The NEW Tactical Choke Tube has a head that extends approximately 2.75" beyond the end of the barrel and features a matte black finish. Specifications for Carlson's Beretta Benelli Mobil 12GA Tactical Muzzle Brake: Manufacturer: Carlson's Choke Tubes Color: Black Gauge: 12 Choke Tube System: Beretta/Benelli Mobil Gun Make: Beretta Condition: New Country of Origin: USA Features of Carlson's Beretta Benelli Mobil 12GA Tactical Muzzle Brake Tactical Breecher M/B: Ber/Benelli Mobil Cylinder Package Contents: Carlson's Choke Tubes Beretta Benelli Mobil 12GA Tactical Muzzle Brake Carlson's Choke Tubes 84130: Tactical Breecher Muzzle Brake: Ber/Ben Mobil Cylinder