The V2 Shock transfer system fix will not work on KWA because of the hop up unit being different (two peice). Also if you get the new 2GX bear box it will be strong at the front (one of the new improvements). If you go to the KWAUSA.com forum there is a post on fixing it by brazing it if you have someone that can oxy-acet. heat it and braze it for you.
Were you using the stock spring?