I have several Durrs Egg locks on my rifles and the one problem I've had with all of them is the frizzen will spring forward and strike the flint. I fixed the problem by covering the flint on top with a longer piece of elk hide leather. I've talked with Tim at L&R and tried different frizzen springs, weaker, stronger, nothing seemed to work, thats just the way they are. An excellent lock. Hope this piece of information helps.