O’Sullivan Conservation has undertaken conservation treatment and restoration of numerous pieces of light and heavy artillery and armament including World War One machine and field guns, and trench mortars.

Treatment can include disassembly and cleaning, abrasive blasting and painting or coasting reapplication, with relevant historical authorities often consulted for recommended paint colours/schemes.

O’Sullivan Conservation has also undertaken conservation treatment of smaller war relics including swords, decommissioned firearms, including rifles and handguns, and war and service medals.