Thirty weapons have been handed over to the gardaí in the first ten days of the guns and knives amnesty.
The weapons include shotguns, rifles, revolvers and a variety of pistols.
Ballistics specialists are also examining a crossbow, a musket, a theatre pistol and a stun gun.
The amnesty will run until the end of October and then mandatory minimum sentences for a range of firearms offences will be introduced.
Four knives have also been handed in along with a grenade, which was live.
The gardaí in Cork had gone to collect a gun from a man who also showed them the explosive.
The man did not know what it was and gardaí had to call in the army bomb disposal unit.
