My Maverick 88 (security) has the standard black stock with the small nub (whatever its called) and a I've added GGG light rail/sling mount, see pics below. I just bought the Mossberg Padded Hunter Sling. Will I just need to attach it to the stock with a standard swivel mount and directly to the GGG mount on the tube? Or will I need something more? the nub looks tiny. I've never looked to add sling since I've had it.