After using this for quite a while I'd like to update my review, I stand by most of what I said before. However, I am getting an issue of it not firing semi and having to flick to full auto, let off a burst, and back again. This has got me 'killed' quite a few times. Also, the rail covers are no longer included in the package from G&G so if you want those you have to buy some different ones. FPS when I first used it was around 365ish but has now dropped down to about 335 after 5 or so games.
Reviewed by Cameron on 29/03/2015
Fantastic gun, very comfortable to use. Wasn't sure about the patriot stock as it looks quite short but the rifle is so light you don't really need it. I did replace with a crane stock in the end though as I play mainly woodland. Incredible range for something that looks more designed for CQB. Was disappointed to find there were no rail covers in the box when I got it but phoned ZeroOne and now have them on order (I hope). All in all a great gun for a very fair price.
Reviewed by Kevin on 13/05/2013
Bought this gun as my team have G&G M4's. I wanted something that looked a bit different so decided on the Viper. I used it for the first time yesterday and its a great little AEG!!. It shoots about 340fps out of the box, has a good rate of fire and range.
It's compact, so will be great for Urban shoots, but it can easily hold its own in Woodland. I would highly recommend this gun to anybody.