Good advice on checking the firing pin condition and tension of the spring. It may not be the problem but there is no harm in checking.

Yeah i learned the hard way about checking the firing pins.

In desert storm, the tip of the firing pin on the coaxial m-240 brokeoff, and take it from me, it's a major PITA to swap bolts with the m-240 still in the mount, under combat conditions.

Those m-240's were fun to shoot ! Made for lots of destroyed targets!

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.

I have never had that problem myself but it is a good suggestion and food for thought. Thanks Rocky

as far as fluid goes
 

quit reloading while in the bath tub!!!

just kidding ya.