Final answer:
The M18A1 Claymore mine is aimed by using iron sights, which are basic alignment aids built directly into the mine.
Step-by-step explanation:
The M18A1 Claymore mine is primarily aimed by sighting through iron sights. There are no scopes, laser guidance systems, or GPS used in the aiming process of a Claymore mine. To aim the mine, the user typically uses the built-in peep sights to align the mine with the target area.