Anyone have a .50 Beowulf upper on their AR-15 lower? Just curious...I was watching a show the other day (Future Weapons) where the host pulled out a .50 Beowulf to demonstrate how to shoot and stop a pursuing vehicle. It only took a few shots to kill the engine and penetrate the windshield. Extremely powerful round (12.7 x 42 mm; 400gr bullets), and it seemed to be very controllable in an AR platform. The .50 Beowulf can be single stacked in AR 5.56 magazines. I found the complete uppers online for $300-$800, but the ammo is outrageous at $2-$3 per round. Not sure when I would ever need to stop a vehicle or shoot attacking wild hogs or bears, but it looked pretty cool! Thoughts?