>>64211479
People have been customizing their guns since basically the invention of firearms. Nobles would have custom, hand rifled pieces before rifling became common place. Multiple notorious outlaws had fancy pants peacemakers and John Dillinger famously got a gunsmith to convert his 1911 to full auto, mounted a compensator and a VFG and had it rechambered into .38 Super. A state backed super spy getting their hands on a gucci 1911 in 1964 isn't that far out of the realm of possibility.