This is a M150 spring made by SHS. This is a dual stage spring, which means the coils get farther and close together in different parts of the spring. This is the way all aftermarket springs are while stock springs are constant rate. It changes how much force the spring applies at different points in the stroke. This spring is very powerful and should only be installed by an seasoned airsmith who knows how to build a gun that can handle this spring.
- .067" (1.7mm) wire diameter
- Best for DMR and sniper rifles
UASR rating: 6.35DR
Spring rate (6kg test): 1244N/m
Spring length: 175mm
More information on UASR ratings here and here.
This product was added to our catalog on Saturday 30 July, 2011.