Bob , The lock is sound ,highly polished and tight. The springs are strong making it nice and fast . The frizzen is cyanide casehardened. It is very good to flint,I only used one all last season ,its easier on flint than my TC and even some of my original locks. Mine is marked Dublin Castle and I'm told it depicts a lock from 1769.Before I bought mine I to was skeptical about "Indian" stuff and with good reason. But a lot of good U.S companies are going off shore with their lines(Gibson,Fender,Browning...)they must have some confidense in the workmanship to put their name on it.Or maybe it's a manure shoot and I lucked out.The castings that they use are from original locks at Parks Canada.(the canadian version of the smithsonium) :imo: