For those attending the Third Coast Airsoft Operation Iron Knife 2025, Airsoftjunkiez is now taking pre-orders for their custom HPA SR25. These rifles are equipped with the PolarStar F2 engine, but customers can also choose a different HPA engine. The guns are configured for 320–490 FPS with a .20g BB, with a rate of fire of 20–33 BB/s.