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That's been around for years. Ain't gonna happen.
As mentioned above, once an MG, always an MG. Like the M16s, the M14 was a select fire rifle from the get-go. A switch was installed to make it possible to lock out the full-auto capability but it won't fly as a surplus rifle because of it.
(1) Except as provided in paragraph (2), it shall be unlawful for any person to transfer or possess a machinegun.
(2) This subsection does not apply with respect to—
(A) a transfer to or by, or possession by or under the authority of, the United States or any department or agency thereof or a State, or a department, agency, or political subdivision thereof; or
(B) any lawful transfer or lawful possession of a machinegun that was lawfully possessed before the date this subsection takes effect.
Just as an aside, the fully capable M14 rifle had a "special" full auto muzzle shroud that covered the original flash hider when you shot the rifle as a full-auto MG. It's not well known and it's quite rare. I've attached a photo. Keep your eyes peeled for one at any show you may go to. They're like hen's teeth.