What, your Excal is leaking?
Is it coming from the solenoid area of the gun? Take off the little plates just above the grip frame, and is the leak seem to be coming from there. If so, one of the solenoids is leaking. It could be a small problem with just the o-rings not sealing, or the solenoid could be bad.
I had this problems with my Excalibur when I got it, and after talking to AKA they sent me a new soleniod that day, I just had to send them the bad one back.
If you are going to take the solenoids off the gun be ready to catch the o-rings that are under them, they are very small and there are 3 per solenoid (I think).
You may want to let one of the techs on this board talk you through it, if you are not comfortable with that. If not, just call AKA tomorrow.
And as far as how much gas it leaks. My didn't leak that much, and I was able to play all day with the gun sooting OK, it was just annoying.