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Don't know, I just soak mine in Hoppes and blow off the excess. I'm not crawling through the sand or chasing boogey men so my requirements are different than some.
Direct from a 2 tour Iraq vet. They were never allowed to do more than pull the bolt and soak it in Hoppes#9(most of which I supplied-for that unit anyway). Some contacts burned 3-5+ mags per man full auto in under a minute but they never had a failure that could be blamed on failure of bolt components or built up dirt/crud in the bolt.
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