What is the component of a firearm that holds ammunition and loads it into the grip?

The component of a firearm that holds ammunition and loads it into the grip is the magazine. The magazine is a crucial part of the firearm's operation; it stores rounds and feeds them into the chamber, allowing the firearm to fire. This mechanism enables multiple rounds to be fired without the need for manual loading between shots, making it essential for the efficient functioning of semi-automatic and automatic firearms.

In contrast, the frame is the body of the firearm that houses the essential components such as the trigger, trigger mechanism, and the barrel. The trigger guard is a protective loop surrounding the trigger, designed to prevent accidental discharges, while the sights are components used for aiming the firearm. These parts perform distinct functions that do not involve the storage or feeding of ammunition, highlighting the magazine's unique role in firearm operation.