Now before you go awol at the price tag I would save up the 400 and buy this bad boy and heres why.
Basicly its made to fit that G&G rifle you'll notice at the bottom it says some modification required. So you buy the rifle and then the heat shield but then you better make sure you have the tools and the knowledge to make some cuts and changes so it fits. Another option if you want a VN look buy the E1 VN M16 you know triaglular foregrip small clip and then buy http://www.airsoftpost.com/echo1-grenade-launcher-with-30rd-shower-grenade-p-28603.html that M79