How long for a ratty then...This is a new one on me,no one says ever how long you sould leave the cylinder in.Hows the King ratty ,the one with the big cylinder as a butt get on with this,same sort of seals.If this is so,then why dont crossman let you know about it,just a thought or am I getting the wronge end of the stick,am very intrested,cheers....Andy