They weren't finished into a rifle barrel in Spain. They had no breech, the barrel blank was milled there then sent to the USA for assembly.Spain can not export barrels that are not proofed. Same as Italy.
Thus, "Made in USA"
There was no requirement too proof what was basically a milled pipe.
CVA legally skirted the laws/rules for some time before the Spaniards changed some export rules to facilitate full Spanish assembly.