Originally Posted by
SeanMP
A fellow over on another forum has a great expression "QB's are a diamond in the rough, but they are rough as a badgers bum" He loves tuning them and has great success.
When you tear it down you'll find that the barrel Orings are pre shredded so have a seal kit or a supply on hand.
I run my 2078A on HPA with the stock tube at this point. I get just about 2000 shots off the 62oz buddy bottle that Eric sells.
You'll find it handy to make a "screwdriver". the valve has a slot that accepts a blade 3/4" wide by 0.100 thick. I made mine from 1/2sq bar with a piece of 1/8 flatstock tacked and ground to suit. The valve will not come out until the two halves are loosened