WOW.I found out how to make any weapon in hl shoot missles. First you need console in half life so in run type in hl.exe -dev -toconsole than while playing half life get out your rpg and waste all of its ammo. bind a button to impulse 101. when your rpg is out of ammo scroll down to another weapon of your choice and than push q to get back to the rpg. push the button you binded to impulse 101 and shoot. lol weird. oh yea and if you use the grenade or lasertrip it looks like he throws the missle