High quality reproduction frizzen spring for the U.S. 1835/40 flintlock musket. Will fit both the Springfield and Nippes. Cast from 6150 spring steel. Has a blank tit on the back side to allow for fitting.High quality reproduction frizzen spring for the U.S. 1835/40 flintlock musket. Will fit both the Springfield and Nippes. Cast from 6150 spring steel. Has a blank tit on the back side to allow for fitting.