Specifications 30caliber (mm) Used by 2006 Bay class landing ship/platform dock L 22019 Project 621 class corvette FS 22021 Thaon di Revel class guided-missile frigate FFG 2 In Service Royal Australian Navy Royal Fleet Auxiliary Polish Navy Indonesian Navy Italian Navy
Oerlikon 30mm cannon
Bay class landing ship/platform dock L 
Project 621 class corvette FS 
Thaon di Revel class guided-missile frigate FFG 
Royal Australian Navy
Indonesian Navy