When you order a custom gun from Airsoftjunkiez, you are given an option on what HPA engine you want installed. In this case of the Airsoftjunkiez Custom Krytac LMG F1, this is kitted with the PolarStar Airsoft F1 HPA engine. This comes with the 3,500 round box magazine, and MadBull Airsoft Red Bucking.
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