How is the internal box magazine in a firearm typically loaded?

The internal box magazine in a firearm is typically loaded through the ejection port. This allows the user to insert cartridges directly into the magazine without the need for disassembling the firearm or removing parts. Loading through the ejection port ensures that the ammunition is correctly positioned within the magazine for reliable feeding into the chamber when the action is cycled.

Loading through the ejection port is particularly common in firearms that utilize a bolt-action mechanism, where the ejection port is specifically designed for both the expulsion of spent cartridges and the loading of new ones. By using the ejection port, the design simplifies the loading process while maintaining the firearm's integrity and function.

Using the muzzle, the trigger assembly, or the bolt action as loading points would generally be impractical, as they do not provide the necessary access to the magazine while ensuring safety and proper operation. Hence, accessing the internal box magazine through the ejection port is the standard method for loading in many firearms.