For the Sig 552 I used this on the front body pin, the first four screws under the hand gaurd and inside the magwell where it screws into the hop up. These are high stress areas that will break before the mechbox, this is simple for me and gives me time to save for the metal body (its expensive in alberta for a recession hobbiest) that might help others.
Originally Posted by Sepulcrum
Guns with screws going into plastic holes tend to be really cheap and it is always better to either; (if it's a decent aeg, G&G, JG,etc..) get a metal/solid black abs body for it or buy a good gun. I have a G&G cansoft and frankly when the clear lower reciever starts falling apart on me, I'm buying a metal one to replace it.
You can't always get what you want, but if you try sometimes you might find
you get what you need.