Categories All About Guns 20mm Oerlikon and “Chicago Piano” Anti-Aircraft Guns On USS North Carolina Post author By Grumpy Post date April 29, 2023 No Comments on 20mm Oerlikon and “Chicago Piano” Anti-Aircraft Guns On USS North Carolina ← The .270 Winchester Short Magnum: History & Performance by DAVE CAMPBELL → Stevens 520-30 POV firing Leave a Reply Cancel replyYour email address will not be published. Required fields are marked *Comment * Name * Email * Website Save my name, email, and website in this browser for the next time I comment. Δ