Carlson's Choke Tubes Browning Invector-Plus 12 Gauge Replacement Flush Mount Choke Tube Turkey. These Carlson's Choke-Tubes are made of a special heat treated 1704 aluminum ensuring that your Carlson's Browning Flush Mount will stand the test of time. The Invector-Plus Replacement Flush Mount for 12 Gauges by Carlson's is compatible with steel or lead shot and may be used with any Browning Invector-Plus Choke System. Specifications for Carlson's Browning Invector-Plus 12 Gauge Replacement Flush Mount Choke Tube: Manufacturer: Carlson's Choke Tubes Color: Stainless Fabric/Material: 17-4 Stainless Steel Gauge: 12 Choke Tube System: Browning Invector Plus (+) Gun Make: Browning Quantity: 1 Additional Features: Non-Ported Country of Origin: USA Features of Carlson's 12 Gauge Invector-Plus Browning Flush Mount Replacement: Tightens the pattern of your shot Compatible with steel or lead shot Package Contents: Carlson's Browning Invector-Plus 12 Gauge Replacement Flush Mount Carlson's Choke Tubes Browning Invector-Plus 12 Gauge Replacement Flush Mount Choke Tube Turkey 19968