Officers heading up a month-long gun amnesty received an unusual addition to their collection - a harpoon gun.
The weapon was handed in at Haywards Heath police station during the countywide campaign.
Rodney Ash, Sussex Police firearms and explosives licensing branch manager, said: "We were quite surprised as Haywards Heath is nowhere near the sea."
He said about 100 weapons had been dropped off at police stations in Sussex since it started on Monday.
Unwanted firearms can also be collected from people's homes.
Officers have already picked up about 25 weapons, including air rifles.
This included a visit to a pensioner, who handed over ten blank-fire and replica guns, which had belonged to her late husband.
Mr Ash said: "People have guns left over from relatives in the war or replicas they don't want hidden away.
"If we can remove such items from circulation it cuts the risk for people."
The amnesty runs throughout this month.
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