RetroArms AEG Spring SiCr with Progressive Winding – M190 Receiver Kit Optimized for high speed (RPS)

Optimized for high speed (RPS) builds

1x Retention spring

and DMR builds

and resistance to fatigue — even in long-term high-stress conditions

and consistent trigger pull for competitive Hi-Capa builds

RetroArms AEG Spring SiCr with Progressive Winding – M190 Receiver Kit Optimized for high speed (RPS)The RetroArms AEG Spring SiCr M190 is a high tension performance spring designed for the most demanding airsoft builds. Constructed from premium Silicon Chromium (SiCr) spring steel, this M190 rated spring delivers extreme FPS output, outstanding durability, and resistance to fatigue even in long term high stress conditions. With its progressive winding design, the spring compresses more smoothly at the start, helping reduce initial gear strain and