I can't imagine i'm the first person to try this and figure it out, but just in case, I wanted to share.
It looks like feednecks made for the victor and similar models with the tabs and with the holes, will fit the hammer 7. I had the same issue everyone else did in having a really rough time using the feedback that came with the gun due to its flawed design. So I took some measurements and ordered this:
Turns out, it fits perfect. And it doesn't look all that bad either. Now I can only imagine that feednecks made by other manufacturers for this style gun would work as well but I am not too sure. I do know this particular one not only fit perfect, but didn't break the bank.
I hope this helps some of you!