Looking at a post Colorado Osprey did in the 6.5 Grendel thread about supporting the AR platform in any caliber, I got to thinking about how many different calibers I have in the AR platform and how many different things you can do with them. So what different calibers do you have?
Here are mine-

.17 Remington, for exploding sod rats
5.56 (of course!), for varmints and stopping the attack of vicious paper targets
6.5 Grendel, for long range coyote and antelope
.300 Fireball, originally for feral hogs
.458 SOCOM, for feral hogs after I saw the results!

One of these days I'm going to get a DTech .338 WSSM wildcat...and maybe a .25 WSSM to, just because.

And to think they started out as a simple, Evil Black Rifle.