I have a G3 SG1 that I've just put a metal body on and it's one consistent mofo, reliable as hell, really fun gun to play with.
Unfortunately I'm going to be selling it this week to make room for the SR-25 I picked up, don't need two big guns... but I know I'm going to regret selling the G3 already, just needs to be done
But yeah, the G3 is an awesome gun.