A set of rings for adjusting the firing force in sniper replicas.
They make it possible to increase the power of the replica by increasing the spring compression in the reloading cycle.
The rings are of different heights, which allows you to choose the right one or combine several.
Springs of different power have different lengths, too high ring may prevent the spring from compressing and locking the piston in the rear position.
The inner diameter of the sleeves is 7mm, and the outer diameter is 11.9mm.
The element was made in 3D printing technology.