Yeah, this was posted in the upgrades section before:
http://airsoftcanada.com/showthread.php?t=30890
Yes, it will be a tight fit, but it will look amazing and recoil will be a bit tougher. I belive it does not add too much more weight. If I did this install, I would put a tougher recoil spring in to handle the metal slide. I would feel safer with the metal frame also. I just dont feel as the the Org. plastic frame would hold up long with the metal slide. Now, the first thing I would do, is but the metal frame, then buy the metal slide/barrel, and the recoil spring. With a hi-flow valve it would peform better too. ZEKE makes great quality stuff that will last. You can chose frome the reg. 6" Desert Eagle barrel, or the massive 10" Desert Eagle barrel.