BDinPutnam
.475 A&M Magnum
If AR platform 5.56 or 9mm? I guess 9mm is cheaper (yeah, I know) and a bit easier to control when shooting? What are the reasons one would want one caliber over the other? Just something about 9mm I'm comfortable with.
Before I got my pistol permit my AR9 was my primary at home weapon with 20 and 12 gauges in the background.
But I live in the woods so ymmv (and now there are also other long guns in the mix for me).