Ported 12-gauge Rem Choke tube with an improved-cylinder .720-inch exit diameter.

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Carlsons Choke Tubes Remington Competition Target Improved Cylinder Gold NSN N
Carlson's item 13491 is the 12-gauge Improved Cylinder member of the Remington Gold Competition Target line. Carlson's lists a .720-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 cut for the Rem Choke system, so the barrel marking or exact firearm SKU must establish that system before installation.
Carlson's rates this Competition Target line for lead, copper-plated, nickel, Hevi-Shot, bismuth, and tungsten loads. Its steel guidance is also product-specific: the restriction on steel larger than BB applies to tubes tighter than Full. Those line ratings do not replace the shotgun or ammunition manufacturer's instructions, and the final gun, choke, and load combination still needs to be patterned.
Add the Carlson's Remington Gold Competition Target IC Choke to your build and see how it enhances your platform.