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Ships within 48 hours · Estimated delivery Sep 10 - Sep 15
Gearbox Compatibility: Version 3 (AK AEG and similar)
offering the perfect balance of strength
Requires reinforced internals
making it ideal for high-stress builds including high FPS DMR setups
1x Retention spring
RetroArms AEG Spring SiCr with Progressive Winding – M190 Receiver Kit Gearbox Compatibility: Version 3 (AKThe 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