although i think that thiswould work
No, it wouldn't.
Would require it to be server AND client sided, and even if you do that it would be off a bit.
It would also be quite difficult to make.
And even if you make it without regards of how off it would be because of ping, how hard it would be to manage, you also have to think about the difference between smooth updates and slow updates.
Smooth updates, because it would require raycasting, would lag the server.
Slow updates would be unsatisfactory.
Can't be just client sided because you can't calculate what your player/gun (depending on melee or not) is looking at.
