Briley Yildiz Extended Choke 12 Gauge Cylinder .000. The addition of a choke-tube wrench flat allows the shooter to easily remove the YGL-XT Steel Choke Tube from the shotgun barrel . Nosler YGL-XT Steel Choke Tube provides extra step-down relief and strength. Steel shot may be fed through the choke without damaging the port the constriction type laser marked on the choke tube body and the constriction type laser indicated on the yoke body. Steel shot may also be fed through the choke tube body but steel shot may be fired out of the choke tube body resulting in the 'choke block' effect. Nosler YGL-XT Steel Choke Tubes have a two-year limited warranty under normal use. In addition to choke tubes YGL-XT also includes a Gas Barrel and Gas Block. Specifications for Briley Yildiz Extended Choke Tube: Manufacturer: Briley Gauge: 12 Choke Tube System: Yildiz Choke Gun Make: Yildiz Package Contents: Briley Yildiz Extended Choke Tube Briley YILX212CYL: Yildiz Extended Choke 12 Gauge Cylinder .000