Which of the following firearms is an example of a caplock muzzleloader?

A caplock muzzleloader is a type of firearm that uses a percussion cap to ignite the gunpowder in the chamber, making it faster and more reliable compared to earlier ignition systems. The inline muzzleloader, as mentioned in the correct answer, features this caplock mechanism where the percussion cap is placed on the nipple at the rear of the barrel. This design allows for a straight alignment of the components, facilitating easier loading and better ignition efficiency.

In contrast, a traditional flintlock relies on a piece of flint striking steel to create a spark, which is fundamentally different from the caplock system. Additionally, a single-shot shotgun typically does not fall under the category of muzzleloaders as it is a modern firearm designed for shotshells, not black powder. Lastly, a matchlock is an ancient firing mechanism that uses a slow-burning match to ignite the powder, which predates the caplock system and is not applicable in this context. Understanding the mechanism of how caplocks operate helps clarify why the inline muzzleloader is the correct choice.