Even with Com, could it be possible to put physics coding into the weapons so that when that selected weapon is being held and the player walks to a wall, the gun hits the wall, but doesn't dissapear into it? if so can someone tell me how?

You could just increase the hull size and use ent_move. Haven't tried it but you should be able to just enlarge the hull to cover the weapon to and it should work.

edit:
Note: this should work without physics

GoldMage

look for view entities in the manual.

I've tried View entities, but I could never get it to work for more then one weapon.