Dive tank for sure. Much drier air that will help keep the inside of your PCP cleaner and free from corrosion. It also much less hassle to just top it up from the tank than the hand pump! Im wanting to get an electric pump soon so I can direct fill the guns and a small 500cc buddy bottle I have directly from that - This should also give me the opportunity for fills up to a higher pressure as most dive shops will only fill the tank to 220Bar.
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