What is the difference between a spring-piston airgun and a CO2 airgun?

A spring-piston airgun and a CO2 airgun differ in their power source and operation mechanisms. A spring-piston airgun utilizes a coiled spring, which requires manual compression before each shot. When the trigger is pulled, the spring releases its potential energy, propelling the pellet forward. In contrast, a CO2 airgun operates by utilizing carbon dioxide gas stored in small canisters. The gas is released with each shot to propel the pellet. CO2 airguns do not require manual compression, but they rely on the availability of CO2 canisters. Spring-piston airguns tend to be more powerful and offer a consistent velocity, while CO2 airguns offer convenience and ease of use without the need for constant spring compression. The choice between the two depends on personal preference, shooting needs, and access to CO2 canisters.