I've been using a single 400g tube of Shell Darina XL for years, on my SAI M1A and FN49 after asking Shell directly what grease to use in a semi-automatic firearm. Holds up well so far. For like $4 a tube, it's pretty cheap.
I'm using that on my KJW 1911. Seems to be working so far.
I think it's Shell Gadus S2 V220, but I'd have to call Shell to know for sure, they keep changing their product names.
Last edited by Dimitri; April 4th, 2013 at 17:19..