HEVI-Shot Mossberg Ported Turkey Choke Tube - 835/935 Thread Pattern 12 Gauge. The HEVI Shot HEVI-Choke chokes help you squeeze every bit of performance out of your shotgun. They feature a longer parallel section allowing for less flyers and denser patterns. The HEVI-Choke tubes extend approximately 1 more inch from the end of the barrel than standard chokes increasing the shot velocity and energy of the shot. They are manufactured with 17-4 stainless steel and come with a matte black finish. Specifications for HEVI-Shot Mossberg Ported Turkey Choke Tube: Manufacturer: HEVI-Shot Finish: Black Fabric/Material: 17-4 Stainless Steel Gauge: 12 Choke Tube System: Mossberg Choke Choke Type: Extended Diameter: 0.674 in Gun Make: Mossberg Gun Model: Mossberg Model 935 Mossberg Model 835 Ulti-Mag Quantity: 1 Additional Features: 45+yds Condition: New Package Contents: HEVI-Shot Mossberg Ported Turkey Choke Tube The Hevishot 450127 Hevi-13 12 GA Extreme Range Black is a quality addition to the HEVI-Shot lineup. For more great deals on Shotgun Chokes by HEVI-Shot please browse our Hevishot Choke Tubes page. HEVI-Shot 450127: Mossberg Ported Turkey Choke Tube - 835/935 Thread Pattern 12 Gauge