Not with an air rig...
Without one it is like running a classic on GG or Propane, but with an external rig you can get some amazing consistency. Both my kokusais vary less than 2-3 fps per shot (semi for the CAR-15) at just about any operable pressure. Point simply being, you can get spring-like consistency with some work and an air rig on a gas rifle, or one with a gas bolt.
Without one it is like running a classic on GG or Propane, but with an external rig you can get some amazing consistency. Both my kokusais vary less than 2-3 fps per shot (semi for the CAR-15) at just about any operable pressure. Point simply being, you can get spring-like consistency with some work and an air rig on a gas rifle, or one with a gas bolt.