What we like about RA Tech is how they take careful time to make videos to explain the gas blowbacks, their custom work, and upgrade parts in a very comprehensive way. This latest video is a testament of that as they present the WE AK74UN Gas Blowback Rifle, the Tokyo Marui Samurai Edge M9 Biohazard, and upgrade parts for the WE M4 & L85 Gas Blowback rifles.

Take to watch the video carefully, there are things explained carefully that you would appreciate to know about.