That's remarkably light for something as well built as this. Then again, there are no metal plates involved.
A G84-4100 (compact with ML switches) weighs in at about 400 g. The USB combo varieties (you can still get 'em in PS/2-only as well) come in 83-key (LCAxx) and 86-key (LCMxx) versions. The 86-key ones have a rather short spacebar.