Well, my little AR upgrade just hit another snag - the tactical light I got is just a little bit too big to fit into the grip I bought for the express purpose of holding it. The good news - the light is definitely worth keeping as a small, very bright flashlight I can keep in the glovebox of my car. The bad news - I still need a goddamn light.
At least I can now take the grip and make sure the light will fit before I buy it.