A regular video update from RA-Tech. In this latest video uploaded at YouTube, they demo the prototype cylinder head for the VSR-11 airsoft sniper rifle; a cylinder set for AEG which you can adjust the length; an outer barrel for the Top Japan M4; and the custom M4 gas blowback pistol.  Watch the video below to learn more and if you want these products, they are available at their Airsoft Taiwan online store.