What Makes The Sig MCX Rattler Such An Exceptional PDW?

The MCX Rattler, Sig Sauer’s flagship firearm, came into existence as a response to a need by the US Special Operations Command for a new personal defense weapon (PDW) that was lightweight, compact and powerful. Apparently, the MP-5, the hitherto PDW of choice for the elite members of the US Special Operations, has been coming short during combat.