Thanks Russ Hudson's comments,I added a thicker bigger pump base, but also lengthen the pump
In addition to lengthening pump,also increase the distance between the two pump will be available as 16 darts horder.
Rifling will increase from the original four to six,
In order to enhance greater accuracy, we tested eight combinations:
1. Small air space/high pressure / long barrel / 100 degrees
2. Small air space/high pressure / long barrel / 150 degrees
3. Small air space/high pressure / short barrel / 100 degrees
4. Small air space /high pressure / short barrel / 150 degrees
5. Large air space /large amount of air / long barrel / 150 degrees
6. Large air space /large amount of air / long barrel / 100 degrees
7. Large air space /large amount of air / short barrel / 100 degrees
8. Large air space /large amount of air/ short barrel / 150 degrees
After testing, short barrel coupled with a large air more stable, and finally decided to increase air tank, this is a big modification.
Because of the large cylinder on the shoulders of a lot of height increase, part of the buttstock a little is not enough, so add a mini-buttstck.
Compare it! what is the difference?