I have a dozen or so, some I don't care for, some are heavy (Rock River varmint) some are quality, dependable home defense and all time training guns (BCMs) and some are accurate lightweight killing machines.
Since some are just for training, and I punch a bunch of paper and steel, it makes me more lethal with the same platform in the field.
I only use two to hunt with. I hunt Pronghorn, Pigs, Aoudad, Deer and varmints with the 6.5 Grendel round.
On paper that round looks a bit weak, but in the field, it's been devastating on all the above.
I love the quick follow up shots with the AR. Since everything wears a can and almost all ARs are threaded, it's convenient.
I like building stuff. I use quality components and get a quality gun in the end. And you know, you have to hunt with it since you built it.
ARs I hunt with are accurate, or they don't leave the house.
All of us have "deer rifles" but variety is the spice of life.