I haven't used the Raven cylinder, but I can tell you that PDI cylinders will not accept stock-spec pistons such as the Laylax without modification.
The main difference between the Laylax Neo piston and the orange one is that the angle at which the piston end is cut. The stock piston and the Neo are cut at 45 degrees to be used with the stock trigger mech. The orange one is cut at 90 degrees to be used with upgraded trigger systems such as the Zero-trigger and the V-trigger.
The main difference between the Laylax Neo piston and the orange one is that the angle at which the piston end is cut. The stock piston and the Neo are cut at 45 degrees to be used with the stock trigger mech. The orange one is cut at 90 degrees to be used with upgraded trigger systems such as the Zero-trigger and the V-trigger.