A look at another custom HPA-powered airsoft gun by Airsoftjunkiez, the Airsoftjunkiez Custom PolarStar SL9 DMR. Dropping in a PolarStar Fusion Engine FEV3G3, the base gun is a 2013 H&K SL9 AEG. This is a big hitter at 520-630fps using Red Nozzle on 0.20g BBs. As for ROF, ti can spit out 20-33 BBs per second as configured by Airsoftjunkiez.