First, get a sear pin. The gun won't work at all without one as you have discovered.
I suspect the leaking around the ASA may have been caused if you screwed the CO2 into the ASA with the bottle pointed down. This allows liquid CO2 into the gun and freezes any o-rings it contacts including the tank o-ring.
I suspect the leaking around the ASA may have been caused if you screwed the CO2 into the ASA with the bottle pointed down. This allows liquid CO2 into the gun and freezes any o-rings it contacts including the tank o-ring.

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