What I shoot in an AR-15 Platform....

From Left to right:

1 .22LR, Because .22 is fun (pew, pew)

2.  .223 (5.56 MM).  It IS an AR

3.  6.5 Grendel.  I want long range.

4.  .300 AAC BLK.  A little more bullet weight and the same magazine loading.

5.  .50 Beowulf.  Just because I can.