Last month we had one of the chemical analyst guys from Hydro Tex come in to our shop and do a training seminar on their line of synthetic lubricants and when it was over I asked him about the use of different lubricants for guns. He said "Oil is for use in pressurized, submerged, or splash lube systems. When you use it on your gun, once parts run over each other a few times, the oil is just there to prevent rust. If your ultimate goal is to actually keep those parts lubed then you want to use grease. The lubricator in grease is just oil, but it is mixed into a soap-like material to keep it from running away from where it is needed. But for what you're doing, definitley, make sure that it will be stable in the temperatures you are useing them in."