KWA’s Variable Performance System (VPS) is a unique method of fine tuning the FPS output on your AEG 2.5 series rifle. It also functions as a quick-change spring guide, and unlike traditional M4’s with such systems, removal of the gearbox is not necessary to swap springs out.
The KWA VPS typically has a 50~ FPS adjustment range, and comes equipped from the factory with a M120 equivalent spring. The primary advantage of this system is you can easily configure your FPS output to meet most CQB or field site limits, which makes the VPS system a versatile multi-role setup.
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