Glock 23 made in USA $399

http://ift.tt/2gnh57k found this Glock 23 for $400 this afternoon and purchased one of them. I then noticed that the website said "US MADE OVERRUN MODEL." Does this mean anything? Is the quality the same as Austrian made? Was this a mistake? I've seen so many different answers on my Google searches. via /r/CCW http://ift.tt/2grITFh