I use this on orings and anything subjected to air pressure.
I use this on metal to metal applications. It is amazing on trigger components.
^This. The Super Lube with PTFE. In general though, what matters is less the what than the why. 50 different lubricant options aren't very helpful if you don't know what makes one better or worse than another. So let me, hopefully, try and provide a little illumination on the subject.
First off, what is the difference between an oil and a grease? The short version is that an oil is typically a Newtonian fluid, that is to say it has a definitive viscosity aka thickness/resistance to movement. A grease is an oil mixed with a soap in essence, to make it a non-newtonian fluid. This matters, because greases have multiple viscosities. They have one hold viscosity, but when a shear force is applied that drops to a new lower viscosity. The long and short of it is that is you have a lubricant with better cling than an oil (sticks around and continues lubricating), but which can still act on moving parts without excessive resistance. The engineering rule of thumb is that immersion applications (like inside a car engine) are oil applications and non-immersion applications (like airguns) are grease applications. This is simply because the grease is better at sticking around than oil.
Okay, so what makes one better than another? Siloxanes are fantastic synthetic lubricants in that they tolerate the sorts of extreme pressure and temperature ranges we subject airguns to completely safely, which is not true of your typical oils made from good 'ol fashioned dinosaur squeezings. Silicones also don't attack things like o-rings or most plastics, although be careful with this one because particularly spray silicones can contain propellants which range from mildly to extremely aggressive. Once you're into the land of silicone, what makes one better than another? Well you can talk about viscosity and such, but the real line in the sand here is PTFE which is an acronym for a long chemical name which is used for all sorts of things. You may know it under brand names like Teflon or Calphalon on your non-stick frying pans. The material is safe for use in airguns, but more importantly it continues lubricating under much much greater loads than straight silicone and is much more lubricious for metal-metal interactions. You can lubricate everything in your airgun safely and happily with a PTFE thickened silicone grease such as superlube. Its good stuff.
Molygrease is molybdenum disulfide, a metal powder essentially, suspended in a grease. It is an extreme load and temperature additive. It is only really a suitable lubricant for high load metal-metal interactions. Industrially it is used as a long lasting bearing packing, among other things. It'd probably be fine on your trigger sears and such, however you can't lubricate your o-rings or anything else that'll potentially see HPA with it. If your trigger is gritty to all hell, or maybe your lever action, this can fix it where even PTFE can't. That said it is MESSY, like black grease that you will never wash out of your clothes or mother-in-law's couch EVER kind of messy. I keep this stuff on hand, but in general don't use it on airguns because I just haven't had one yet which would necessitate it.
I hope something in there was helpful.
