Well not really LEGO, but you get the point:
A portable alternative that won’t degrade as badly as sandbags or concrete under sustained fire. For cost effectiveness I still don’t think you can beat showing up with some bags or cardboard with wire over it (HESCO) and filling it up with the same stuff you’re walking on. If this is safer though, doesn’t cost a mint, and they have a way to easily get it to a FOB then why not?
It’s called the 3-Dimensional Interlocking Protection System, and is made by Ballistics Research. Lots of info available in the powerpoint download (fail, I know) on their site.