Operating pressure for any mag is about 800psi or higher. The level 7 mags can run down at 650 to 700 psi with the right setup, but they won't be quite as responsive. Level 10 mags definately require the higher end of the air pressure range to work properly, so you should aim for at least 850 psi for a tank output pressure.
I am surprised that your old setup worked with an output pressure that was as low as yours. I suspect the output of your tank is a bit higher than 350 to 400 psi.
I am surprised that your old setup worked with an output pressure that was as low as yours. I suspect the output of your tank is a bit higher than 350 to 400 psi.

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