Ares M170 Spring for TX Upgrade Kit

The Ares M170 Spring for TX Upgrade Kit is an upgrade spring specifically for the Ares TX series.

We regularly get the question which spring gives which fps / joule, which is very difficult to estimate because it depends not only on the spring what this value will be after placing the spring. The air seal of the cylinder, piston and piston head also have a large share in this.