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I've found Airsoft Innovations Tornado grenade oil to be perfect for lubing GBBR bolts, o-rings, buffer tube, etc. However, I would advise NOT running it through the areas where gas travels through the projectile path, though - this would cause a lot of fouling due to the viscosity of it and its tendency to pick up dirt.
For standard GBB pistols, all you need is 2-3 drops of Airsoft Innovations light weight silicone oil in your propane tank every 8-10 fills.
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