[Hectic]

It is true that with a .20 the vsr10 (all of them) have a cyl. volume equal to about a 500mm inner.
dependant on what velocity you are running you will then run a heavier bb and itll sort of even itself out. If you are runing 450fps or less on a .20 .36 or lighter. 450-550fps yer runnin .36min more likely .43's
And with say a 400-455mm inner. Then you play with hop up and bbweights to find the best setup. If you plan on keeping a short barrel you could extend the port on tje cylinder