Wd-40 and any lubricant with petroleum distilate in them can adversely effect o-rings and some plastic parts...
Dont have any experience with that specific weapon but... you can use 60 weight pure silicone oil (just dont touch the inside surface with your bare hands has the oil secreted by your body is somewhat corrosive to brass (if that what your cylinder is made of).... That why most aeg cylinders have finger prints heacht into them!!
You can purchase the oil from any hobbyshop selling remote control race car (it's suspension shock oil)
Put on a nitrile glove put some oil on the middle finger and coat the whole surface to your personnal licking...
Curious to see what kind of flack i'm going the draw from John, Paul and Ringo!!
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It ain't the years, it's the miles.