I had a friend over and we dismantled then put my A-5 back together. I shot it today and everything acts normal, except when I open up with the RT. I can see CO2 mist leaking frome everywhere along the seam in the frame and out the rear, the whole marker gets covered in condensation. I did not notice this before, but maybe it was the high humidity this morning. It functions OK but I want to fix this since I have shot my A-5 for awhile and not noticed it like this before.

What did I do and how can I fix it?

Any help is appreciated, Thank YOU!

I am used to the blowback gas venting, but this is a lot of gas! It ices over the surface of RT microline. It was very humid this morning, maybe the cold CO2 made more condensation then normal. I will try the marker out again soon and see if it does it again. I thought maybe I had something out of alignment.

Yeah if it were more humid it would be more noticable because its basicaly quick-freezing the tiny bits of moisture in the air. Just like when you shoot when it raining, it always seems more noticable then. In my experiance Iv found myself surrounded in a cloud after holding down my trigger on a humid day.

Theres nothing that would cause excessive blowback, so the humidity is the culpret.

OK great, it must have been augmented by the humidity. With a 3 second burt it would ice over. I field stripped it because I remembered something.from when I had put it back together with my friend before. I remember the trigger group/grip part not seating perfectly. The plastic frame on this part gave enough for me to get the pins in. 

When I opened it up I saw that the coupling between the RT flow control and down inside the marker had the factory grease blown away from it. I think it didn't line up perfectly. I reapplied a tiny bit of grease and took off the expansion chamber and drop forward. With nothing attached the Trigger part poped in perfectly, then I attached the expansion chamber, then the drop.