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.
A bias spring structure for pressure regulators for increasing flow capacity. The inventive device includes a specially shaped metal disc. The bias spring is a circular, thin, conically shaped, metal disc, with a center through hole, and having specifically controlled height and thickness values.