Carlson's Choke Tubes Browning Invector-Plus 12 Gauge Ported Sporting Clay Cylinder. This Carlson's Shotgun Choke is manufactured with 17-4 stainless steel to ensure the long life of your Shotgun Choke Tube. The Invector-Plus 12 Gauge Browning Shotgun Choke By Carlson's features a long parallel section allowing for tighter denser patterns with minimal flyers to worry about. The Carlson's Browning Choke Tube has the constriction size laser etched on the side for easy reference in the field. Specifications for Carlson's Choke Tubes Browning Invector-Plus 12 Gauge Ported: Manufacturer: Carlson's Choke Tubes Color: Black Fabric/Material: 17-4 Stainless Steel Gauge: 12 Choke Tube System: Browning Invector Plus (+) Gun Make: Browning Quantity: 1 Additional Features: Ported Included Accessories: Choke Wrench Country of Origin: USA Features of Carlson's Investor Plus 12 Gauge Ported Shot Gun Choke: Gives your shot a tighter pattern Reduces damages caused by repeated use Extends 3/4in past the barrel Package Contents: Carlson's Choke Tubes Browning Invector-Plus 12 Gauge Ported wrench Carlson's Choke Tubes Browning Invector-Plus 12 Gauge Ported Sporting Clay Cylinder 18891