Not according to Jerry Kuhnhausen (p. 147). Go read the part where he says: "Although many DCM carbines appeared to be in as-new condition, all were shipped with components that did not pass ordnance gauge inspection..."
Superseded parts were included in the 'other' category, fair enough. But the other three sections detail physical deficiencies. As an example he presents a photo of an as-new appearing trigger housing with a mislocated trigger pin hole that could present a safety issue (several other TG problems omitted for brevity).
Would a carbine with the potential for accidental hammer release fit your 'serviceable in every respect' assertion?