Thanks for the comments.
Link to the rail system:
http://www.troyind.com/shop/product_...products_id=47
As mentioned above the Trigger guard is made by Magpul. One thing we noticed with it though is that Magpul makes 2 different ones. The ones we bought from WGC Shop didnt fit the Systema PTW, but does fit most other brands of AEGs. The ones we purchased from RS dealers did however.
It is said that the PTW should have 100% correct measurments, something other airsoft weapons don't have.
Our conclussion is that Magpul makes 2 versions, one for airsoft and one for real steel. Like they do with magazines, stocks and so on.
The Flashhider is an airsoft-hider. Don't know what brand since i picked it off a teammate.