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It isn't the bolt, it is the bolt carrier that is different between the semi-auto and full auto versions. The FA bolt carrier is made to trip the auto sear; the SA carrier is cut away so it can't operate either a regular auto sear or a DIAS.
If you are buying a selective fire rifle, then it should have the correct upper and the appropriate bolt carrier in it, so I am not sure what your concern is about another upper.
Jim
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