I've got an 1876 in 45-60. Shoots very well with the 30" barrel. I'm having problems with light firing pin strikes. Like out of 30 rds shot yesterday 15 were light strikes. Cocked back the hammer and it'll go off the 2nd time. Can someone point me in the direction of instructions on how to take these rifles apart so I can take a look on what's going on with the firing pin. Thanks for any help.