Which action confirms that the magazine catch has locked the magazine in place?

Inserting an empty magazine into the pistol effectively confirms that the magazine catch has locked the magazine in place. When the magazine is fully inserted, it should engage with the magazine catch, which prevents it from being inadvertently removed while still allowing for a smooth insertion process. If the magazine catch is functioning correctly, the magazine will click into place securely.

This action ensures that the magazine is not only fitted properly but also locked in a manner that allows for reliable feeding of ammunition during operation. A secure connection between the magazine and the magazine catch is vital for the reliability of the firearm, as it affects ammunition handling and overall shooting efficiency.

Other actions listed, such as releasing the slide stop or depressing the trigger while holding the slide, do not provide a direct indication of whether the magazine is securely locked in place. Similarly, rotating the disassembly latch lever pertains to the disassembly process of the firearm and does not relate to confirming the magazine's security. This emphasizes the importance of proper insertion to verify that the magazine catch is functioning as intended.