When You buy in full sets they are alwaych less expencive then making tune up step by step. Here is full RA-Tech tune up set for WE SCAR wich includes:

- Full nozzle set with N.P.A.S (Negative Pressure Adjuster System).  This will allow full regulation of valve wich allows adjustment of BB's nozzle velocity.

You adjust it from nozzle side with special key wich is included in to the set. This great improvement compearing to the original WE solution.

-Full steel pin system responsible for opening of magazine valve. Standard we system has short lifespawn when You are using CO2 capsules. It is specially designed to be used with CO2 powerd magazine.

- Silicon hop up rubber with new adjustment for hop up chamber.

-Full steel barrel socket

Replicas fited with RA-Tech tune up kits are best solution  on the market, fully prepered to worck with CO2 and avaible to keep full efficiency when You are using standard Green Gas.