No , they don't list a Super Mag with just a slug barrel .
Besides all the slug barrels are 3" chambered .
Weather it comes with a 3" or 3.5" receiver .
I cut and pasted the plain one , camo is the same except for the finish.
Ultimate versatility is provided by the Model 870 Express Super Magnum Combo. The base shotgun is a standard Super Magnum with checkered hardwood stock, vented recoil pad, 3 1/2"
[align=center]

[/align]
chamber and 26" vent rib barrel with a Modified Remâ„¢ Choke. Combined with this is a 3" chambered, 20" fully rifled deer barrel with rifle sights that can go from the field to the forest with a simple barrel change.
Johnch