To me mil-spec means that parts should interchange between the military firearm and whatever "civilian" gun claims to be "mil-spec". Also the gun has to be configured more or less like the military rifle. So some target AR-15 with free float handguards and fancy bull barrels and adjustable cheek rests is not mil-spec no matter how many parts you can swap between it and an M-16. Obviously a 7.62x39 AR-15 is not mil-spec. But that's just my definition.
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