I was a late-comer to the AR game. After four enlistments in the Army, I just didn't see the AR as a "hunting" gun. My M16 was my work rifle and after work, my friends and I would grab our "hunting rifles" and go hunting.
It wasn't until I got out and my sons got older that they caught they AR bug.
My oldest built a couple despite my misgivings- in my mind ARs were still army weapons. He finally talked me into going to the range with him. I even got a little nostalgic- and before you know it, I was hooked.
My initial interest was just building a couple with my boys. After a while I caught the bug- it's fun to shoot, ammo is cheap and you can buy more add-ons then you can for a Ruger 10-22.
I finally got my own Rock River and love it. It's been designated as my coyote killin' gun but this year I'm going to give 'er a run on deer.
Oh, and stickin' it in the eye of the anti second amendment folks figure in it too.