Yep! That’s a a trigger shoe alright! Just get rid of that thing. You can pick up a little hex drive set for like $10 at Home Depot, auto parts stores, harbor freight. They have those tiny little drivers..

See why pics are so helpful from the beginning? Had you posted a pic to begin with, my first answer would have told you it was a trigger shoe & has little set screws, LOL! That was at 5:30…You probably would have had time to go out to get one of those sets! J/K.