Good luck finding an H&R/NEF for that these days but the Turkish single shots can be had pretty cheaply. No idea why the guy went with 28ga and about those welds..... It looks like some of the homemade shotguns I've seen in Central America and Asia.
I'll stick with my old H&R 20ga, it's both one of my least expensive guns and one of my very favorites. I'd be nice if PSA reintroduced them, and especially the barrels for them, now that they own the brand name (not sure if they got the rights to the product line or not). I still kick myself for not having bought a .357 barrel when they were like $60- now the barrel alone sells for hundreds, on the rare occasion you find one.