H&K used to be the US distributor for Benelli; then back in, uhm, 1998 maybe, they broke away and formed their own distribution company, Benelli USA. H&K never manufactured the shotguns; they were all Benelli.
When Benelli broke away it left a hole in the shotgun category for H&K, which is why they picked up distribution for another Italian brand, Fabarm.
Then THEY broke away and were picked up by SIGarms.
I believe currently that H&K no longer have a shotgun for distribution.
So there you go.