It's specifically suited to short range, suppressed, small, light rifles. It was designed to run through an AR with minimal change required (barrel change), and if memory serves, it was designed for two different kind of rifles interchangeably.
It will also blow a rifle apart if chambered and fired from a 5.56 by mistake. (Iirc, it will chamber in a 5.56)
(Yes. I read alot)