Rust

just a quick note/warning

if you have been breathing on your airtube in cold, there is a good chance that you may find that the long pillar screw/bolt, holding the stock, will rust.
Mine looked really bad, sorry no picture. The one running inside the pistol grip, needs some oil or Vaseline to protect it.

I have not had mine out in the rain, it must have been the condensation running down or something