Assault Rifle - Butt looks too long, maybe shorten it up a bit and make the barrel longer
Machine Gun - Looks good, but I'm assuming this is a heavy assault weapon, so I doubt there would be a clip, rather a ammo box + belt.
Sub Machine Gun - Looks fine the way it is.
Assault Rifle...
Not everything is a democracy...internet forums and chat rooms require moderation, and it takes too much time and energy to create an "election" for moderators, its rediculous!
And who cares if he deleted your post, probably you, and only you. He is the moderator so therefore it is his...
those look pretty good, and when they're skinned they'll look even better.
I suggest doing some work on the shotgun though, looks a bit too blocky.
And since this is for HL2, you can handle quite a few polys so you should try and put some more detail into them.
Actually I was watching The Screen Savers a little while ago, and a guy asked about using a Plasma TV for a monitor...but they said some LCDs work just as nice for games as a CRT monitor.
I can't remember what brand it was (I think it was NEC, is that real?) but they use them for their LAN...