I'm of the camp that the only needed accessory is expanded magazines. ARs are famed for their furniture but I don't find any of it really necessary. Accouterments can easily go from being beneficial to a shooter's experience to change for change's sake. The Sport II is a solid platform that I don't think really needs much in addition. As some others have said, put rounds through the gun first before thinking you need to "jump in" with remodeling. I've seen some YouTube videos that stress "Well, what you need to do is spend $3000 in added barrels and tools to make it good" that seem more like catering to their sponsors than providing needed advice.
It's a great gun at an amazing price point for Canada. Learn the gun, examine yourself and your habits before thinking it needs reworking. Unless you just want a show pony, then feel free to slap whatever you can find on it.