retro valve upgrades

[free_punk]

I am planning on getting a retro valve for my minimag. What additional upgrades do i have to make to my mag in order for the valve to run at its best?
Thanks

[Quiet]

2x trigger and of course HPA

[Xzion]

Well, Id have to say the 2X trigger is a good way to optimize performance of an RT Valve, though the HPA, its mandatory, the ReTro Valve ONLY runs on HPA, though it has been said that people have had it run on CO2 that had excessive methods to keep out liquid CO2, as RT Valves tend to suck liquid CO2 up quite well otherwise.