Not to confuse the issue...
But there ARE semi-auto M14's out there.
I have one, the receiver is made here in the USA by a company in Baltimore, Maryland called Armscorp. My receiver states "M14NM", plain as daylight.
No, it doesn't have a Springfield, Inc receiver, nor is it a reweld, or Chinese.
People tend to forget, in their haste, that M1A is nothing more than Springfield, Inc's registered trademark for their semi-auto copy of the U.S. Rifle, Caliber 7.62mm, M14. As such, anybody else who builds a semi-auto M14 clone runs the risk of copyright infringement if they name their creation an M1A.
I'm assuming it's the same logic that causes people to call office copy machines Xeroxes, even if they were made by IBM, Panasonic, etc.
Regardless, it does a disservice to folks like Smith Enterprises, Armscorp, and Enterprise Arms, who do indeed build semi-auto M14 receivers...