How much does the barrel of an M2 weigh?

The weight of the barrel of an M2 machine gun is established as 26 pounds, making this the correct answer. This specific weight is important for understanding the handling characteristics and operational logistics of the weapon. In military applications, knowing the weight of components like the barrel aids in planning for transportation, mounting, and overall usage during operations.

The other weight options provided do not correspond accurately to the specifications and testing data for the M2 barrel. Each of those values would not reflect the standard weight associated with this piece of military equipment, emphasizing the significance of precision in weapon specifications for operational effectiveness.