http://images.vfl.ru/ii/1595101635/957b4822/31109348.jpg

In the player's Inventory Underbarrel grenade launcher (40 mm Grenade Round) has no charge stripe. Thus, the player does not see the UGL loaded or not charged, ready to fire or not....
It seems to me that earlier this worked, just like with regular magazines, but if I'm wrong then just add a strip when it's loaded and ready to fire.