350. But beware, if you have them downgrade your gun, they'll just cut the spring
352 is as much as they will allow. They are very strict and like the other comments say, any downgrade is a chop job rather than a heat and press. Do your self the kindness and chrono at your local proshop before you go
350 fps with 30 rps (rounds per second). If its over thr fps, pay the professional techs and they will fix it up. They will usually cut your spring if its close to the fps or require you to buy a new one and they will install it if its aot older.
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