Spectre Airsoft has this quick review of the FCW 400-Roundd Gas Drum Magazine that can be used with the Tokyo Marui MWS Gas Blowback Series... "Hey guys today I'll be doing a quick review of the FCW (Flintlock Custom Works) 400'Rd Gas Drum mag from Flintlock Custom Works/ Octagon Airsoft. Overall review of this drum mag, is that runs really well, feeds wonderfully, it can feed the 400 rds. no problems and with plenty of gas left in the tank! I've never seen a video done before about it, so I decided to make one, since I haven't seen one floating around. I have seen hpa drum mag vids floating around, but they never show what's actually inside the drum mag and how they made in work, which is dumb in my opinion lol. But here! I'll be showing what's inside the drum mag itself and the mechanisms that are in play to make this drum mag work!"