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Need advice for max mpa air that i can fill in my aea terminator 357

Max fill is noted on the receiver. Follow directions. Mine was a 30cal and I filled to 3,400psi. Too much pressure results in valve lock. If it fails to cycle properly, manually cycle and dry fire until it functions properly. Then chrono until it runs out of speed. Note your velocities to identify your psi working range. With unregulated guns , more pressure is of no value. Bill.