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Use light weight (10weight) silicone oil for seals such as o-rings, also use it in the buffer tube (fast motion, little mechanical wear). For where the hammer is contacted by the bolt carrier, I use Superlube with just a drop of light weight silicone oil (although I'm sure white lithium is ok too) on both the hammer and bolt carrier. You should NOT be oiling the hop-up or barrel.
So in summation you really only need a light weight silicone oil and a grease of some type, personally I recommend Superlube but there are many others that work as well.
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