The striker itself doesn't present a leak source, but the valve certainly does. The leak from the barrel could be either the cup seal or valve orings(015) and the leak from the striker area could be either as well. The striker oring just acts like a sail to help catch blowback air instead of letting it go past and only holds pressure immediately after you pull the trigger.
Some blowbacks also need to be cocked before you gas them up or they will blow air like no tomorrow.
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