Have used these for 25 years from Ron Long through Davis, great lock for light rifles and pistols, Herschel, Steve Davis used on their squirrel rifles. Can round tail, engrave to match old locks. You'll see them all through old Muzzleloader articles. A Leman rifle and several pistols still working fine after 20 years, used on some arms for last Alamo movie. Nice balance in springs, lock does not eat flints. Picked up two more from Tim at CLA this year.