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Always thought it peculiar that the lower is the serialized part on an AR, but the upper on a Ruger Mark series pistol is the serialized part. Never made any sense to me. When you think about it the design/function of both guns is pretty identical. Both the uppers support the barrel and bolt, and both the lowers house the fire control groups and magazines..... But on one of the guns the upper is the serialized part (Ruger) and the other one has the lower as the serialized part (AR).
Makes no sense to me.
I think in that case, the Ruger is oddity. Most pistols have the grip/frame as the serialized part, not the slide. For instance, the Browning buckmark has the grip being the serialized part.