- 4pcs/package (instead of 2pcs as before)
- CNC POM made
- Fits APS2 spring guides, include SRS, Mod24, SSG24 and other 9mm spring guides
- Each rings adds ~5fps depending on setup, both on light and heavy bb (increases joule creep)
- Addable amount of rings depends on spring coil number and wire thickness (up to 15 rings in some cases)