I looked through the FAQs and gunsmithing articles but didn’t find any info about this.
I have a 2003 Model 10 in .223. I’m very happy with the precision it is capable of (usually around 0.4 MOA) but it will frequently shoot a “3&2” or have one unexplained outlier. I have heard that weak firing pin springs can be the cause of this. Once I had the firing pin out it looked more complicated than I expected. It seems there are adjustments on both ends of the spring. I figured I better get some advice.