These are Remington factory replacement barrels. Cantilever mount Rem Choke barrels include Improved Cylinder and Extended Rifled tubes. 11-87 slug barrels are not intended for light loads and are not equipped with a pressure compensating gas system. Deer barrels are not equipped with a pressure-compensating gas system and will not function with target or light field loads.
Notes on Remington factory replacement 11-87 barrels:
The forends on Light Contour Model 11-87 shotguns are shaped to follow the curve of the slimmer-profile LC barrel. A standard vent rib or deer barrel cannot be fitted unless the forend is opened up to accept the larger barrel or purchase a standard profile forend.
Cantilever Rem Choke deer barrels are supplied with improved cylinder and extended rifled choke tubes.
Rifle-sighted Rem Choke deer barrels are supplied with rifled and improved cylinder choke tubes.