[Kokanee]

google, "systema ptw review" gets you a barrel full of reviews;

http://www.google.com/search?sourcei...ema+ptw+review

Although the Arnie's one is most likely the most reliable;

http://www.arniesairsoft.co.uk/?filn...m16_review.htm

And right here on this board;

http://www.airsoftcanada.com/showthr...hlight=systema