No advantage just looks and coolness.
Other mods only needed for people with Sears.
Yes that is a normal hk94 style shelf he installed. Any clipped and pinned lower housing for a 94 style gun should fit.
I'm in. I'll dm you my email address. Please send me shipping info.
Maybe a dumb questions but..... If I wanted to do this and a Form1 sbr, would it make sense to do this first and submit my Form1 as an Mp5-N? or would I still list SP5 on the Form 1? If I did the Form 1 first as an Sp5, would it cause problems that I then had it remarked to Mp5-N?