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I would not have them muddy (or rusty??), maybe a little dusty, but not much.
I agree with Gino on this. The weapons look dirty, not camouflaged. I would suggest spraying the dark gunmetal color, followed by a black wash and as a final touch perhaps picking up the raised details with drybrushing lighter gunmetal. Be sure not to drybrush the parts of the guns which are not made of metal.
If you want to do camouflaged weapons, by all means go for it. Unfortunately, these do look muddy to me.
Mario