By "slug barrel" do you meen a fully rifled bore or a fixed choke(probably imp-cyl) barrel? There should be a great number of 18.5" ghost ring sighted barrels threaded for choke tubes out there. The problem is you may have to find one attached to a gun and an owner wanting to simplify to a fixed choke and trade.
M1 Super 90 barrel
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howdy- I've got the HK Benelli M1 S90 Tactical with the slug barrel and ghost ring sights- Looking hi n lo for an 18 in. with ghost sights that will take choke tubes- Saw them on the Long Island site, but guy says 'no more'- anyone with a point in the right direction?-appreciate it-
