The STI Spartan line (III, IV, V) frame, slide and barrel are manufactured by Armscor (Phillipines) on a separate line built to STI specifications. All the internal parts are made by STI and the gun is assembled by Armscor. Then the gun is shipped to Georgetown, TX for quality control and distribution. All warranty work (if needed) is done by STI. A Spartan purchase is supported like any STI product; the customer would never notice a difference. Additionally, STI customer service is of the best in the industry.
I got a Spartan V 9MM about 4 months ago and it has been 100% reliable after 500+ rounds, accurate and darn fun to shoot.