I double dry my air before I fill my tank. I dry the air before it goes into my Shoebox compressor and after it comes out of my Shoebox compressor. I have never had H20 in my rifles.
DRS Pro 25 700, out of the box slug shooter, I have only added the carbon fiber barrel sleeve. I have installed a Leupold Mark 4HD 8-32x56 for pdogg'n this year.
Sorry to hear that you have had so many problems ! I have a DRS Pro 25 700 and it is Awesome ! I also have a DRS Classic 22 700 and it is very nice also. Good Luck !