I was on a course in which a friend of mine was shooting a borrowed, new KAC SR-15 that did not run reliably until the buffer and spring were lubed, IIRC.
I recall that he was fairly frustrated by the issue because lubing the spring and buffer was certainly not the first thing he thought of, or attempted. I think it was eventually suggested by the instructor after all the obvious stuff was tried.
Full disclosure: I'm the editor of Calibre Magazine, which is Canada's gun magazine. In the past I've done consulting work for different manufacturers and OEM suppliers, but not currently. M4C's disclosure policy doesn't seem to cover me but we do have advertisers, although I don't handle that side of things and in general I do not know who is paying us at any given time.
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