Airsoft Internal Parts

Prometheus Non-linear Spring MS110
$13.00
Upgrades the FPS of your AEG from approximately 350 FPS to 380 FPS
Polarstar Jack V2 Conversion Kit
$340.00
he Polarstar JACK V2 M4 Engine - HPA Standard FCU Conversion Kit. This is the full sized FCU version for easy programming. Fits in most M4 and M16 airsoft guns for a full air line HPA engine conversion. Contains everything you need internally. Works d
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