a topbreak single action revolver such as the currently manufactured Italians
Revolvers run better dirty and you can stick one in a drawer and neglect it for 20 years and it will still work as designed whereas autos magazine springs under pressure may not work if neglected long enough.
Topbreaks take the ejection problem out of the equation. The Schofield model was designed to be opened and unloaded with one hand while on horseback. You can reload with speedloaders without the grips interfering with the operation as sometimes happens with swing out DA revolvers. Very easy to clean.