tunabreath-
Im take chance for select twist rate
Mass paintball is differente systeme im using 2 systeme 1 electro-mecanical and full mecanical. For the airsoft im using new systeme because Quebec law do not permit more of 500 fps and im need make sure the rifle cannot of any time any way make more of 500fps.
(Funny pass- time but the law is the law)
If you whant know how this rifle(airsoft) is make see for (internal Qb-78) on google image not same but give you really good idea