The M1 carbine was another special case. When they were made, there was little thought to matching parts. The Carbine Committee would have excess production shipped to other arsenals for use in assembly. they were so serious about maximizing production, they even told Winchester to not bother making barrels, Inland could supply them with all they needed. Winchester being Winchester, they still made barrels, but grudgingly used Inland barrels to meet production quotas.
Several wars later, and with multiple rebuilds, if a carbine is "all matching Winchester", it is likely because a collector scoured gun shows until he had all the parts needed, and assembled it himself.
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