All good suggestions above. I would say the first and most likely problem area would probably be related to extraction, so extractor spring, insert, extractor, o-ring (if you use it), etc. An easy way to address this is to simply have a spare bolt (with extractor, gas rings, etc. already installed). An even better way would be to have a spare bolt carrier (complete with bolt etc.) because that would address some other common sources of malfunctions.
If you don't know, there are many different types and brands of extractor springs. It would be a good idea to find what works in your guns, and stock up on the exact same ones.
Don't overlook good magazines and good ammo for your guns. You didn't ask, but those are areas that are much more likely area to cause malfunctions in my humble opinion.
Joe Mamma
Last edited by Joe Mamma; 01-25-21 at 08:52.
"Reliability above all else"
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