actually I think you are think of the g36 which I am alomost finish with the headshots on now. the g3 I started liking once I started using it more as a medium to long range weapon like a sniper/br it became one of my favorite weapons.
My friends and I are now annoying the crap out of people in call of duty now though for we are playing hardcore search and destroy with all of us using noob tubes (gernade launchers) we also have every maps angles worked out so that they are not even able to shoot a bullet before there whole team is dead most of the time we spawn aim and kill them accross the map. we had people do it to us so we worked out the angles and judge how fast people move when they spawn and presto we can kill the whole team when they spawn.
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