Mach Sakai reviews the WE Airsoft M4A1 RAS Gas Blowback Rifle. This is a full metal GBB rifle that can be taken down like the real thing. With the RIS you can mount weapons accessories to configure the rifle to your requirement. Usually compatible with the WE M4 CO2 Magazines, we don't know if the version for the Japanese market is the same.

Read the full review here and below is the video version: