Looking for a slug barrel with iron sights

[newfieredneck]

I have a Mossberg 12 gauge semi-auto from the late 90's that I am trying to find a slug barrel for.
No problem finding this South of the border but nobody wants to ship even a gun part, let alone a gun across the border with our messed up and totally convoluted laws regarding guns and importing of such.
I have looked high and low on this side of the border using the internet and catalogues etc. but with no luck.
If anyone knows of a good place for hard to find parts in Canada (and not just complete guns), I would appreciate the feedback.

Trev