Speaking as someone who shoots rifles "lefty", I just don't get the Lefty Stag ARs. I really don't. The AR is a very "ambidextrous" weapon to begin with, really. The two biggest issues are the mag catch and the selector, both of which have solutions (some better than others.) Now you've got some really non-standard parts to deal with.
I have a Norgon on my AR, and I rarely ever use it. It is the best design I've seen for an ambi-mag release, but it still isn't great. There is no leverage on the little button, so if you try to eject a mag with rounds left in it, it is very hard to activate. If the bolt is locked back on an empty mag, it works fine. I'm thinking about having it drilled and tapped for an extended lever.
Anyway, glad to see you have joined the BRC (Black Rifle Club.)