If you want to try and fix it yourself you will need to know where the leak is coming from, easiest way to find that is to get onto a paintball form and start asking questions. once you know where it is coming from you can replace the seal that has gone bad. If you dont want to work on it yourself the next best thing is to send it into a shop and have them work on it.
Check your gun's documentation and the bag of small parts that may have come with it. Many have a cup seal or similar mechanism and explain in the documentation how to inspect and/or replace it. Some even come with a spare seal.
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