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SAI did make a "few" transferable select fire M14's. Some of the "full auto" parts are different from the USGI M14's. I believe one major difference is the selector switch mounting post or "stud". A GI switch will not work on a SAI M14 and vice versa.The difference is the mounting "stud" or "post" diameter.
FWIW
Gunny
FWIW
Gunny