Which of the following is NOT a main component of a muzzleloading firearm?

A muzzleloading firearm primarily consists of three main components: the barrel, the lock mechanism, and the trigger. The barrel is the part through which the projectile is fired, guiding it out of the firearm. The lock mechanism is essential for igniting the propellant, which can include flintlock, percussion cap, or other ignition systems. The trigger is the mechanism that, when activated, releases the firing pin or hammer to strike the primer or ignition source, allowing the firearm to discharge.

The term "magazine" refers to a component used in most modern firearms to store and feed ammunition. However, in the context of muzzleloading firearms, they do not utilize a magazine system like those found in repeaters or semi-automatics. Instead, muzzleloaders are typically loaded one shot at a time through the muzzle. This fundamental difference in design underscores why the magazine is not considered a main component of a muzzleloading firearm.