I do wonder about the "metal on metal" sound of the g43. Also, adding bass, even if it didnt really sound like that persay makes the room shake if you are using speakers which makes it feel more like a gun is being fired.
I will say that if you simply turn your sound up higher the guns sound MUCH more realisitic. The only thing is that you have to use speakers for that so as not to kill your hearing. I also find that what kind of output device (speakers, HFs, 5.1 HFs) you are using makes a big difference in how the game sounds in general.