More than 20 guns and other weapons have been handed in at police stations across the Cleveland Police area since last Monday, when a month-long gun amnesty began.
Inspector Harry Simpson said: "We had two amnesties in the force last year, but this still shows there are weapons out there that have obviously been lying around for years.
"They can still be deadly if they fall into the wrong hands and the safest place for them is with us.''
The weapons handed in so far include a 19th Century shotgun, a smoke grenade and thunderflash, a deactivated Lee Enfield rifle, two revolvers, a crossbow, a CS gas canister and 143 rounds of ammunition.
The amnesty aims to get guns and imitation weapons off the area's streets before gun laws are tightened up.
Insp Simpson, who is co-ordinating the operation, said: "This is the chance for everybody in Cleveland to clear out their houses and get rid of such weapons safely."
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