Hey guys so I bought an a5 a few years ago when i was playing paintball and then immediately stopped and never got to use it. Used it once about 8 months ago and it worked great. Now I'm trying to sell it. I hooked up the CO2 tank and it wont fire when i pull the trigger, but when I unscrew it CO2 shoots out. Tried it a few times. Even took it apart and everything seems to be in place and the tube is clear. Now when I screw it in the CO2 just shoots out the little hole in the connector. Any help as to how I can fix it so that I can sell it? Any help is appreciated.