That is the idea Bigtanker. I thought I read that a forward vertical grip on a pistol is a no no.
I don't see how adding finger groves to the magwell makes it an NFA item. You can get a lower with the mag well molded w/ groves. It's no different than holding on to the magwell. In my opinion, changing the texture of said magwell doesn't meet the requirements of "adding a second vertical grip".