Hammerli International Misfires

I've owned a Hammerli International for quite a while and its now giving me some misfires with CCI SV and Eley Club. I've cleaned it in and out as to instructions by Larry, Ed Hall, etc. I'm not 100% sure that cleaning it without cleaning the firing pin is going to solve the misfires. Can anyone share how to remove the firing pin for cleaning? Might the firing pin be replaced? I'd be happy to share a picture of the firing pin if I can take it out. Thanks.

99% likely you need new mainspring. They are notorious for getting shorter.
Jon

Thanks, I’ll replace and see if that’s the issue