No, this gun isn't made in the United States of America. It doesn't make it any less cool and effective though.
Made by ASELSAN, this Turkish firm develops all sorts of systems for the Turkish Armed Forces. They've been doing so since 1975, and one of their latest developments has been the SMASH 30mm naval system.
Aside from that, ASELSAN also makes:
In addition to its really unique stabilizing platform, the user interface is top notch as well. An electronic user face allows the operator to switch between tasks anytime be it day or night, all the while providing accurate fire.
The video will show you exactly how accurate these things are. On rough seas, the turret moves with the wake and hits a target dead center from a pretty significant distance.
Check it out for yourself.