Carlson's Choke Tubes Turkey TSS Browning Invector-Plus 12 Gauge Sporting Clay Choke Tube Full. These Choke Tubes manufactured by Carlson's Choke Tubes's have a 1704 Aluminum body that is specially treated with heat to ensure durability. The Carlson's Browning Shotgun Choke has a parallel section in the choke that is 25percent Larger than previous models thus throwing more consistent patterns than conventional Shotgun Chokes. This Carlson's Shotgun Choke is knurled on the end to allow for quick and easy removal and has the constriction laser etched in the side for reference. Specifications for Carlson's Choke Tubes TSS Browning Invector-Plus Turkey Choke Tube: Manufacturer: Carlson's Choke Tubes Fabric/Material: 17-4 Stainless Steel Choke Tube System: Browning Invector Plus (+) Gun Make: Browning Quantity: 1 Included Accessories: Choke Wrench Country of Origin: USA Features of Carlson's 12 Gauge Invector-Plus Browning Choke-Tube: Tightens the pattern of your shot Compatible w/ Lead Copperplated Nickel Hevi-Shot Bismuth Tungsten or Steel Shot Knurled end for simple removal and attachment Constriction is etched on the side Package Contents: Carlson's Browning Invector-Plus 12 Gauge Choke-tube Carlson's Choke Tubes Browning Invector-Plus 12 Gauge Sporting Clay Choke Tube Full 18867