Handmade Rapax springs: manufactured in Europe to provide the best and quietest performance for your sniper airsoft replica such as SRS/VSR/SSG24. Confirmed results of reaching 1 Joule with a standard SRS/VSR/SSG. FPS may vary depending on the configuration used in SRS, SSG24 or VSR-10. If the Rapax spring is too powerful for your field limits, you can trim a few coils without damaging the integrity of the spring, as long as it is done correctly. The first thing you will notice is a lighter pull compared to standard springs — in short: less effort for more joules. All springs have the same length, use the same material, and have the same number of coils, etc. The wire used in the production of Rapax springs is of the highest quality, ensuring a longer service life compared to other springs. The heat treatment of these springs is carried out in a way that guarantees a long lifespan and very minimal FPS/joule loss over time. The springs are manufactured with strict diameter tolerances, preventing the "twang" sound in sniper airsoft replicas. *Only compatible with 9MM spring guides*