Two possibilities readily come to mind. Either the oil inside the bolt/trigger assembly has gunked up really badly and is preventing the trigger engagement seer from holding. Or, the the engagement seer is worn down and needs to be replaced.
Since it hasn't been shot in a very long time the first is a real possibility. Remove the stock from the receiver and remove the bolt. Clean the trigger assembly and bolt REALLY well with brake cleaner and then LIGHTLY reoil with a good quality gun oil. Reassemble and take it to the range. If it still fires prematurely, take it to a gunsmith.
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