Yes. Thats exactly what you have when you attach that mag to the rail. You can argue it with the ATF if you want but I think they will see it as a VFG aswell. Its not worth the trouble to me. If you must have this "tacticool" accessory, have your pistol registered as an AOW by an SOT 07 and have him transfer it to you for $5.
Ok. Just watched the vid. I thought the pic posted was the product in the video. The item in the video would not be an illegal AOW. The mag attached to the rail like in the pic posted would be. Also, anyone notice that the glock in the photo has a hammer??
I believe it would fall into the AOW category. The question is,WHY THE HELL WOULD YOU WANT IT ??? I guess you could be like that guy on Miami Vice and put a sling on it to carry under your white linen suit, and dont forget to leave off the socks.
For 1/3 the price I can sell you a slightly used piece of broom handle and half a roll of duct tape.