870 Rifled Slug Barrel - scope mount?

[Scorpion8]

Picked up an 870 fully-rifled slug barrel, from Remington-made, but it has this odd scope mount. Is this for some Picatiny rail mounting with two threaded screws?

[Scorpion8]

SOLVED: It is the barrel mount for the scope cantilever. If you've seen the cantilever-scope mount for a slug gun on 870, 1100-, 11-87, etc.... this is the mounting point on the barrel. It is not a stand-alone scope mount. Now all I need to do is find a cantilever arm....