Now this is a very interesting question. Typically what are being compared are 2 types/classes of guns. For example: 2 AEGs, an MP5 vs. an M16. Unlike firearms, guns of the same class basically perform the same way although some differences do exist. Guns with longer internal barrels will slightly have longer ranges and accuracy than those with shorter barrels.

In terms of durability and reliability, airsoft guns manufactured in Japan are typically better than those made in Korea or Taiwan because manufacturers with proven track records make better products and also perform better.