Bingo Airsoftworks went heavy this time for their custom airsoft project as they took an M2 Browning Machine Gun and installed a PolarStar Fusion Engine... "Here's a video showing the M2 PolarStar Fusion Engine conversion sustained rate test firing. I didn't run out of BBs, I just got tired of holding up the gun! It's shooting 450 fps w/.2g BBs at 80 psi. 23 RPS."