Mark Mercer, 47, of Toll Bar Houses, Workington, is accused of taking ??1,530 from Maryport Post Office on Monday as well as several firearms offences.
No pleas were entered during a brief hearing at Carlisle Magistrates' Court and Mr Mercer was remanded in custody.
A 24-year-old woman also arrested in connection with the raid has been released on bail until 14 March.
A man has appeared in court charged in connection with an armed robbery at a post office in Cumbria.