SHS Spring Guide Extension Unit

An extension unit sits behind the spring guide and takes up length, which pre-compresses the spring slightly and raises muzzle energy without buying a stiffer one.

It is most useful where a spring sits just under the number you want, or on a short-stroked build where the standard spring no longer fills the space it used to.

It is a tuning part rather than a repair one, and a small change goes a long way. Chronograph after fitting rather than assuming, because the step can be larger than expected.

Specifications

Good to know before you buy

Treat it as a spacer and measure the result. Fit it, chrono the rifle and compare against where you started — what it does depends on the guide and the spring already in the gun, so the number on your own chrono is worth more than any figure on a page.

Frequently asked questions

How much will it raise my muzzle energy?
Our supplier gives no figure and the answer depends on your spring, cylinder and barrel. Chronograph before and after; do not assume.

Will it fit my spring guide?
Unstated by the supplier. Compare it against your guide before fitting, and ask us if you are unsure.

Is this safer than fitting a heavier spring?
It is a smaller step, which makes it easier to land on a site limit. It is not a way of avoiding a chronograph.