I own an G&G CM16 raider short version the polymer on it feels alot like the glass reinforced nylon on my etek3 paintball marker. It is very tough yesterday I drop my gun down the stairs to my basement and it was perfectly fine I've also heard stores of guys falling on them while running, dropping them on rock, and all sorts of other stuff.
There pretty tough and good little shooters I recommend them if your looking for a light weight or relatively cheap platform that you can run right out of the box all though I suggest switching out the hop up to a metal one, and rubber I suggest getting the PDI W hold rubber.
Do not shop at New 2 you Buy & Sell in Hamilton, On. Unless you want to be ripped off.