Ya, funny, I never really gave much thought to the shader, but after you asked, I went and checked and it's phong_bump_specular. (On the gun). Maybe the normal and specular are already on? Not sure, kinda a shader noob. It's just my go-to shader for custom media, because it "works".
Also if you look closely, the gun HUD image is actually of a M24! I got it from http://pimpmygun.doctornoob.com/index.php
. There was no M700 so I improvised. Other than that, no shaders for HUD.
The scope image is really difficult to get "round" Not sure what the actual dimensions should be, but this is 700x1024. Will have to scale it down. I Did all fonts/textures in GIMP.
[Errant AI does nice work!]