Briley Remington RemChoke Flush 12 Gauge Extra Full .040. Using patented Impulse Shot Technology Briley choke tube manufacturers guarantee improved accuracy and the durability to extend the life of your guns as well as provide a choke tube that produces an even stream of buckshot without deforming the pellets as the choke is inserted. As with all Briley products Briley Rem-Choke Flush Mount Choke Tubes are turnbuckle straight have knurled ends and are backed by a solid company guarantee. Specifications for Briley Remington RemChoke Flush Choke Tube: Manufacturer: Briley Gauge: 12 Choke Tube System: Remington Choke Gun Make: Remington Package Contents: Briley Remington RemChoke Flush Choke Tube Briley REMF12XF: Remington RemChoke Flush 12 Gauge Extra Full .040