We always like seeing these HPA engines for airsoft seen working in support weapons in which they work best. HPAirsoft installed the PolarStar Fusion Engine V2 in a Browning M2 50 Caliber Machine Gun, and is the heaviest we HPA-powered airsoft gun so far. This uses an 800mm EdGI 6.01 Inner Barrel, Prowin Chamber. Maximum performance is 630fps at 16bps and they reduced the velocity to theplanned 450fps and 40bps using 0.28 to 0.30g BBS and mounting it on  a buggy.