Does not fit - FAB Defense Gradus Rubberized Ergonomic AR Pistol Grip

First off it does not come with a bolt if it did maybe I would not have had an issue. The problem is it won't fit on any of my receivers or any of the other bolts I have that do fit those receivers (most are Magpul). The bolts I have are all too long because this grip has a very shallow mounting point and to make matter worse it's very narrow so I could not find a washer(s) to help with the depth issues. I don't feel much like tracking down a shorter bolt when it should have had one in the box. I tossed it into a drawer likely never to be seen again. To be clear I tried it on 3 different PSA lowers, one Sig and one Aero. The Sig had a no-name grip on it and the others all had various Magpuls. The bolts would bottom out before the grip got tight.