The guy that converts FALs to all sorts of calibers. I suppose his biggest claim to fame is the FAL swap-out sleeved config he made that lets you change calibers easily. Using that as a base, you swap out a few parts an viola you have a new caliber FAL.
He posted pics a while back of a few AKs he converted - among other things - to .50 Beowulf. It looked NASTY with that big half-inch hole staring at you. The pics are no longer available but I think it was a SAR - looked like a SAR-2 conversion (5.56) which would make sense, because the Beowulf uses an AR rim to allow it to be shot out of AR rifles with minimal parts swap-out.