+1 to Asvarox. I've never had an alien (

) be visually blocked by my gun. If it's in front of me I'll see it before it gets there, and I'll track it and keep it in the middle of my screen so it WON'T get there (under my gun, that is). If it's behind me or beside me in such ridiculous proximity, I'm...
A) two-shotted and dead anyway...
or
B) playing a blind kid and getting a free kill...
but either way it's not hidden by my gun.
Anyone want to get into a server and demonstrate how ridiculous and impractical it would be to get into a position where you'd be hidden by a gun? I think that the player would know you're there, anyway, and that's all the information (s)he would need (as seeing the dretch in the split second it's below your gun wouldn't help you to determine it's target, direction, or hostility, anyway.) I really feel like trollin' 'cause this suggestion is so obscene...
But imma let you finish.