The stock is not nylon they are steel as you can see if you read this or take a magnet to them.
http://www2.towerhobbies.com/cgi-bin...=++&search3=Go

I am sorry to see you are going to buy GPM, as I will not run their products! You know why there parts are so cheap? They are made from cast and not billet and cast is not near as strong. All so I have experienced there quality control but I do wish you good luck.