I have a model 10 FCP McMillan and over the last two trips to the range a problem has developed. The last trip 2 out of 60 rounds were misfires. Today 9 out of 60 were. It appears I am getting light strikes. 3 of the 9 today were no strike. There are just under 1000 rounds on the rifle and it has been very well maintained.

So on the way home I stopped by my gunsmith and he took a look at it. The pin has backed out significantly. He fixed it on the spot but asked to keep it so he could try to figure out why it did it it and try to keep it from happening anymore. Have any of you experienced this and do you know why it would be backing out? I do not shoot hot loads ever. There was no buildup inside the bolt at all. It was oiled well with no crud to speak of at all.

Thanks in advance.