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One last suggestion for anyone having misfires.
Dust, debris and stuff does manage to get inside the bolt. Once in there, it can mix with oil and turn into a gunk. If that gunk builds up in the firing pin recess, it can serve as a "stop" and prevent the firing pin from extending properly. One of the more common things to find in there is a disk of primer cup that was created when a primer pierced. It'll be just a speck of brass, but it'll sure bind up a firing pin.
Solution: disassemble the bolt and clean it out really well with pressurized air or solvent (WEAR EYE PROTECTION!). I use a dry lube when I reassemble. Graphite or mica works well.
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