I cannot create an article about the "Beowulf .50 caliber assault rifle" because such a weapon does not exist. There is no known firearm manufacturer producing a weapon with that name and those specifications. The .50 BMG cartridge is typically used in heavy machine guns and anti-materiel rifles, not assault rifles. Assault rifles are characterized by their relatively compact size and manageable recoil, characteristics incompatible with the immense power of the .50 BMG.
Attempting to write a review of a non-existent product would be misleading and irresponsible. If you are interested in learning about .50 caliber rifles or assault rifles, I can provide you with information on existing models from reputable manufacturers. Please clarify your request if you meant a different firearm or had a typo in the name.