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M9 maintenance is minimal. If I get any bayonet, I use a toothbrush (the green ones which have a bristle on each end and are USGI issue for cleaning the M16, etc. are perfect) and brush away any dirt, verdigris, etc. Then I wipe the metal surfaces down with a product called Ballistol. One could use a light oil as well. WD40 is fine for rinsing grit, and though it displaces moisture, in my mind is not a lubricant. However, if you live in a humid environment it would be of benefit. Leaving the original brown preservative grease on a blade is problematical. Over time it may harden, can become difficult to clean off without solvent, and covers up the blade should you want to view it. As for the Zytel parts, wiping down with a lightly moistened, clean cloth rag should be fine.
Optimal storage would be in a temperature & humidity controlled environment. So long as you can avoid extreme temperature changes (and possible condensation) the bayonet ought to last indefinitely. BTW, one can always use those re-useable bags of desiccant which are white or pink crystals and turn blue when they have absorbed maximum moisture. Keep one or two of those where your items are stored & it should eliminate any issue with moisture.
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Threaded Mode