No offense tim, but you kinda not know anything about the game of airsoft. Or at least the guns.
The JG Doesnt make a G3 SG1 it makes a G3A3, which is a OD greenish color, unless you can prove me wrong.
The "full metal M9" means nothing to me, unless you name a brand. For example, it could be a HFC, for 99 bucks or a nice KWA M9 PTP which is 149.
They are both full metal, but the KWA M9 is more reliable, it is half accurate, but not as accurate as the plastic Tokyo Marui M9s "TM"
The KWA PTP shoots around 350 fps using green gas, which is basicly propane and silicon oil.
THe HFC on the other hand is prone to gas leackage, inaccuracy, and not as reliable.
The JG G3A3 may have barrel sag since the barrel is so long, and very heavy, like the TM G3SG1. Which is the Sniper varient of the regular G3.
May you be more specific, at least putting down the links to the websites?
I hope I wasnt to agressive
FdSaKiLlEr
Wow that was fun!