You know what is really funny? Who owns the intellectual property rights to the design of the AR-15? Is it Colt? Is it Armalite? Uh, no, that design is part of the public domain, owned by the public because contracted products DESIGNED FOR THE MILITARY, including the intellectual property rights, the design itself, becomes part of the public domain. There is no copyright protection because the gun was DESIGNED FOR THE MILITARY. Colt only holds the right to the name, not the design. Why you can find so many other manufacturers of this AR-15 style rifle, chambered in many calibers, including the .50.