Carlson's
Ported 12-gauge Invector-Plus tube with an improved-cylinder .730-inch exit diameter.

Carlson's item 18993 is the 12-gauge Improved Cylinder member of the Browning Invector-Plus Gold Competition Target line. Carlson's lists a .730-inch exit diameter, a ported extended profile, 17-4 stainless construction, a gold finish, and a parallel section 25 percent longer than its standard flush tubes. It is an Invector-Plus tube and must not be substituted for Standard Invector, WinChoke, or Invector-DS.
Carlson's rates this Competition Target line for lead, copper-plated, nickel, Hevi-Shot, bismuth, and tungsten loads. Its steel guidance is product-specific: the restriction on steel larger than BB applies to tubes tighter than Full. Those ratings remain subordinate to the shotgun and ammunition manufacturers' instructions, and an Improved Cylinder label does not eliminate the need to pattern the exact gun and load.
Add the Carlson's Invector-Plus Gold Competition Target IC Choke to your build and see how it enhances your platform.