I’ve been trying to find some kind of database of production years of KAC rifles based on their serial number, but can’t find any. I’m specifically trying to find out what the production years for a SR-15 with a serial number in the KM100xx range, which appears to be a very early run of the SR-15. It’s also marked KMC, not KAC. It has an A2 upper with carbine length handguard but with an A2 buttstock.