This sound is suppose to go with the USP. To install, drop .vpk in addons folder. This is not my work and I do not take credit for it.
Black USP pistol replaces m1911. This is not my work and I do not take credit for it. . Just re-uploading it. Drop .vpk in your addons folder in your left4dead directory to install. This is a mod features a custom model so it doesn't work on dedicated servers.
USP Pistols replace the M1911 for L4D. This is not my work, give me no credit. I only found this mod in a large mod pack on gamer's hell. This is a re-upload with a translation of the original uploader note and a edit of the script. This mod only works offline and on local servers hosted by the user
1 Custom Pistol Sound Demo Left 4 Dead 04/12/12