I have posted about this in other threads.....
I picked up a Steyr LP50 long barrel at great price..
The gentleman only used a hand-pump to fill up the cylinder.
Well with any new gun to me, the first thing I do is tear it down.
To inspect, clean and remove excessive lube,...etc.
Well to my surprise, the 2 cylinders had almost 1/2 ozs of water in them.
The reg and plenum also had moisture in them!!
So the moral to this...... Please empty the moisture trap regularly!!!!!
When I first got my first PCP(Rapid MKII), I used a stirrup pump..
I would usually do about 30 strokes. Stop to let the pump cool down.
But most important, I would drain the the Moisture Trap!!!
Yes this meant a little more work..... but my gun stayed DRY!!
Good Luck,
Stuart