Buy OSRS Cannon furnace
The cannon furnace is one of the four parts of the dwarf multicannon in Old School RuneScape. The multicannon is a strong Ranged weapon that fires at monsters on its own. The furnace is the last part you attach. First the base goes on the ground, then the stand, then the barrels, and then the furnace on top.
Once the furnace is in place, the cannon can hold 30 steel or granite cannonballs at a time. The cannon then auto-targets enemies and fires fast, hitting up to 30 damage. This makes it a great tool for training Ranged and clearing groups of monsters.
You need to finish the Dwarf Cannon quest before you can use the cannon. It can be set up almost anywhere in Gielinor, but not near Nulodion and not on Entrana. The furnace weighs 5 kg. It is tradeable and can be noted, but it cannot be equipped or stacked.
Players who want a new look can apply a shattered cannon ornament kit to the furnace. This turns it into a cannon furnace (or) with a Shattered Relics League style.