The M27 IAR combines mobility, accuracy, as well as heavy firepower. Take a look at this vid from the guys of the Military Channel!
And if you´re interested, get your airsoft version of this rifle here: www.sniper-as.de/product/M27_IAR,_%28S%29AEG/id/10796
http://youtu.be/hM66Gv3YYDg