The article is missing a key step: choose your caliber! Being modular you can swap the barrel, or upper receiver, depending on caliber and have your choice. The standard .223 is a great caliber for some game, like coyotes, but is too small to legally hunt deer and above in most States.
If that’s your pleasure you’ve got a lot of AR platform compatible options: the .300 Blackout, the 6.8 SPC, the 6.5 German, the .277 Wolverine, the .35 Yeti... And many more.
For most big game hunters a better caliber than the usual .223 is probably the way to go!
Damn always on phone spell checker!
6.5 German should be 6.5 Grendal.
Don’t forget 50 Beowulf if you want to a big hole in something like a brown Bear charging you or perhaps .458 Socom. I had a .458 Socom upper for a while and with a 330 grain punch bullet it penetrated 50 inches of wet newspaper and stuck in the wood behind it at a John Linebaugh seminar.