I don't think extraction issues will be fixed with grease. There are some good threads on the various carbine forums about extraction and ejection problems. On my first carbine, I ran down the list on one of the threads. First isolated a magazine I knew worked. Wrong or extra power recoil spring can cause problems. Correct spring should measure 10.25 inches. Ordered a new and correct one and problems got better. Seriously cleaned bolt, bolt parts and chamber. Problems got better. Rebuilt bolt with new ejector, extractor and springs and problem went away. Sometimes you need to run down the check list; several things can contribute, none are particularly expensive to fix.
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