Before you dive into this post, note that many assumptions are going to made here...
So I happened upon a discovery I don't think anybody has discussed before @StrangerDanger. M1014s inside H&K's famous Grey Room with bayonet lugs! So we know for a fact H&K used to import Benelli weapons, we also know that military M1014s have H&K markings on them.
We can see below, the unmistakable silhouette of the M1014 in different lengths and the first generation ghost ring sights & bayonet lug. The bridge sight is an indicator of very early import examples.
Youtube Video Source: https://www.youtube.com/watch?v=9FJKoWgbU7E