Had no luck finding a match, either.

Government Issue is a closer than Liberator:
http://www.myfonts.com/fonts/jnlevine/government-issue/

Thanks for the try!

It is either Blender or Gridnik modified.

I think Gridnik is more likely—I looked at Blender initially (http://www.typophile.com/node/120544), but thought the joints weren't sharp enough.