For clarity, a semiauto can be converted to fullauto legally by use of a registered auto sear, which has the same legal status as a machinegun.
All legal machineguns/sears have a serial number and the ATF issues you a tax stamp to possess that particular item.
As a third party, you might do your friend a favor and call the ATF requesting the existance and disposition of that serial numbered item. If there is no number, or it is not in their database, then you know that it isn't legal to install.
BTW, the M14 makes a really crummy automatic rifle.
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