All credit on the weapon models go to the Black Mesa Team.

Weapons —
9mm
Shotgun
375
Rocket Launcher
Crossbow
Crowbar

Warning: some of the models used in Black mesa Source were found as Half-Life Source Weapons.

Noticed by ComebineUlitmate I forgot to put in the M4 so here’s a addon of it http://www.garrysmod.org/downloads/?a=view&id=100622