Which pin is it? The front one, the little in the middle (that I think it might be, as you said trigger pin) or the one behind the grip?
On my G&G, front one was held by a spring+pin combo, the little one upper of the trigger has a side bigger that the other, with splines on it to hold in position.
It might be due to those splines, try pushing it back on the other side.
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