Latest TopTech M4 electric blowback at RedWolf Airsoft... "Using patented technology from G&G, Top Tech has released an AEG with a new kind of blowback system. In this version, part of the compressed air is driven into another piston on top of the gearbox, and blowback action is provided simultaneously with shooting the BB for increased realism. As soon as you lift the Top Tech M4 from the box, you notice that it is made in a very solid fashion with no flexing or creaking to be found.

It has a nice heft of 3kg to it, which is very close to the weight of the real thing."