I've owned a ICS MP5, upgraded, I put about 8,000 through that... never had a problem, and that's at 400fps, but again, only 8,000 BBs.
Now, I own a ICS M4. I would recomend it if you are looking for metal... and if trades do not matter to you, you can buy it at
Canadian Airsoft for $535 + shipping, CRAZY cheap.
As for G&P, I was planning on picking one up... but, make sure you know your field's rules or are willing to downgrade. They are hot at about 370 FPS.
By the way, you and BrokenFan, STOP ASKING STUPID QUESTIONS... keep it all in one thread, or ask in the chat... preferably click search.