so i did some digging in the waw and bo1 mod tools files, and have some updated files to give you, and not the greatest advice since i dont know jack shit about scripting.
so here are some higher quality images you could use;
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~-gorniment_silver_dark.iwi
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~~-ggold_spec-rgb&~-rblacknes~9126c4c9.iwi
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orniment_soft_n.iwi
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tiny_bumps_n.iwi
so, the tiny_bumps_n may look better on the waffe, raygun, etc. but is there a way of overlaying this file onto the already placed normal maps of those metal parts? if not then just try putting that as the normal map for those guns just to test.