These skins with more definition are from the beta, I also decided to place the world models for ar2 and gravity gun.
Before upload "HL2 New enviroment textures", I was going to include this small part that later I decided to raise it apart, knowing that many people personalize the skins of weapons and characters.
This add-on add the next. (You can you can right click and "see image" option)
As I mentioned before, i add the world models of AR2 and Gravity Gun by the autor AsIsAy