high pressure piston

[cobra65427289]

if i run hpa then is it a must to get a high pressure piston for the stock A.I.R. valve?

[56kSomeGuy]

If your using a preset high output tank(about 850psi) You don't need anything the A.I.R. valve will regulate down the pressure by itself since it has a built in regulator. (if your using a adjustable hpa tank then turn the pressure to about 850psi this is where the mag works best)