  Unzip this to your Half-Life folder. It puts a silencer.bat in the 
Half-Life folder, and creates a 'silencer' folder in which it puts a pak file 
in. The pak0.pak includes a map, which the bat will run,  the w_silencer.mdl 
replacing the w_9mmhandgun.mdl file so it really looks like the silencer in 
the world view, plus sprites for the HUD. When you get in the map simply go 
over and get the suit, the weapon and ammo and shoot. Be sure to check the 
HUD sprites. 
  This allows mod groups to replace the standard 9mm with one that has a 
silencer on it. This was all in the pak file, but was never used for 
Half-Life. Someone just needed to figure out a way to use them. Please do 
credit me with this info if you release it. 
Thanks.
--Spider


Hellbringer says:
Thanks Spider!

NOTE: If "silencer.bat" isn't working for you, try running "silencer2.bat"

2nd NOTE:

[Thanks to Spider for this info]

If you want to be able to use the Silencer in your maps with WorldCraft,
you have to edit your Worldcraft .fgd file to get this to work.

This standard 9mm line:

@PointClass base(Weapon, Targetx) = weapon_9mmhandgun : "9mm Handgun" []

Gets replaced with this one, so you can choose the silencer body:

@PointClass base(Weapon, Targetx) = weapon_9mmhandgun : "9mm Handgun" [
      body(Choices) : "Body" : 0 =
        [
                0 : "Normal"
                1 : "Silencer"
        ]
]
 
 
THEN, in WorldCraft you can edit the entity Properties to choose the type of gun.
  
Enjoy!

--HB and Spider
