Yes Rigid is a United brand, but Rigid knives are made different places of different steels. I have a 5 1/2 inch Rigid stockman, it's got beautiful stag handles and is made in Germany. The current Rigid pocket knives are made in the USA of 440A. I was hoping the bowie was made from something better than 420J2, but that may be wishful thinking... The U2X may just be the model number, as they have the habit of putting it on the blade.
Thanks Brian!