angel a4 fly with freak barrel and fbm trigger, empire LP tank.
Very fast, very light, inexpensive
Basically this trigger gives your a4 fly the same feel as an 05 speed, which has a roller bearing trigger design. Because the fbm trigger is made of delrin, it feels much lighter and allows for a much more sensitive trigger pull. When i first switched to this trigger, I could immediately fire more bps. Its also a very cheap upgrade.