High HB,
The modifications done to my gun are in excess of 120 pounds for parts, work time, paint, oil and gas alone. The gun in its previous state was bought for 65 pounds.

It will never compete with a PCP as A) I only get 20 shots on one co2 bulb, and B) the accuracy is effected by temprature, bulb pressure (affected by temprature as well) and the fact that it will never be as accurate as a second hand PCP.

I didnt build my gun to make it as good as a PCP, otherwise I would just bought a PCP and hunted with that. The tuned Rabbitstopper needs a lot of TLC, and understanding to use it. You must be mechanicly sound enough to strip this gun apart for further tuning, adjusting and maintainance.
A cheap 150-200 pound PCP will do the job far easier then the modified Crossman RS. 20 usuable shots is just a joke if you ever want to target shoot. This gun is used for squirrel hunting because it is light and easy to point upwards.