Thanks for the tips, but I doubt if the Chinese will use them
http://www.friends-partners.org/pipermail/fpspace/2006-May/019800.html
Liquids would not work too well on the Moon, where the dust problem is severe.
The way to handle dust in that environment appears to be to make sure that dust does not accumulate in the first place. Electromagnetic fields in the barrel would seem to be the best solution.