I too shoot lefty and I have been happy using a midwest industries qd sling adapter on my sb tactical brace and a rail mounted magpul ad adapter. Mine is setup with the midwest mounted on the left side of the brace while aiming down sights and the magpul just behind the front sight on the top rail. I have not tried using the sling with the brace folded but I do know that in that configuration you would be able to fold it. Good luck.