The BlackLeaf Airsoft Speed Board for PolarStar Jack / F1 / F2 | Safety / Select Fire allows you to have an enhanced trigger switch.
Semi/Full Auto
0.25mm Trigger Travel
Electromechanical Safety (Selector plate and Safety Lever are Required!)
Works with the PolarStar Jack, F1, and F2
Works with M4 / V2 Style gearboxes with traditional trigger mechanics. Not Ares, Amoeba, etc.