A few things...
Why do you need moly or graphite anywhere on a PCP gun? Both are extreme pressure, sheer resistant dry lubricants. Unnecessary on all counts in a PCP.
Caution: most all of the paste or goop type moly lubes will thicken drastically with time and in cold weather. This will cause major issues.
Silicone doesn't go on threads period. It's about as good as water as an actual lubricant and will cause metal threads to gall.
Any black oring in a PCP gun is Buna rubber. It's not affected by petroleum lubes, and is in fact the same material as most orings in your car engine. So don't go nuts believing you have to use SILICONE (not SILICON) grease to preserve the orings. Use anything you have handy, it doesn't matter.
Most lubed parts in a PCP don't really even need lube to begin with. Using the wrong stuff or too much will do much more harm than just doing nothing. There is no extreme sliding pressures to contend with, except for a surface that contacts a loaded spring that has the potential to turn when compressed, like a hammer spring. But again, any plain old grease will suffice, as it's hardly an "extreme" pressure.
Just some things to think about.
