Don’t press the small spherical button beneath the ejection port even though you’re putting a cartridge in the chamber, it will damage! (Picture courtesy icollector.com). Developed in 1898 John Moses Browning’s Auto 5 was in manufacturing by various suppliers from 1902 up until 1998. The earlier guns made by Fabrique https://localgunstores43962.onesmablog.com/exploring-the-versatility-of-the-b-t-apc9-9mm-semi-automatic-pistol-an-overview-75372102