If I wanted to I could say GoW got the idea from the UT2k4 weapon that did the same thing on a larger scale, but that would be mean of me, and off-topic.
This wouldn't really be a super-weapon, and it would be fun to hit sky-scrapers with is and watch it tear a little hole down though the floors.
Probably use some of the stuff from Ephis Air-Strike Add-On.