A review on the physiology of Insulin like Growth Factor-I (IGF-I) ... by Debnath, Surajit / Advances in Environmental Biology.
The spring piston airgun generates power using a powerful spring-loaded piston that is housed within a compression chamber. Cocking the gun (using a break barrel, side lever, or under lever mechanism) causes the piston assembly to compress the spring. When the spring is released it pushes the piston forward compressing a column of air in the chamber behind the pellet.
Spring-Piston. The most common type of airgun is the spring-piston type. Unlike pneumatic and CO2 pellet guns, there is no storage compartment for air or gas on a spring-piston airgun.neumatic airguns are extremely popular, especially in America. Whereas spring-piston airguns enjoyed a following in Europe and other countries, the pump-up pneumatic gained popularity here in America. Names such as Daisy, Crosman, Sheridan, and Benjamin were household names when describing airguns here in the States.