Gmod Select Sound Effect Direct
You will need a tool like GCFScape to open VPK files. Common Paths: sound/ui/buttonrollover.wav (Hover) sound/ui/buttonclick.wav (Selection)
wpn_select.wav : The standard sound played when selecting a weapon or item in the HUD. gmod select sound effect
If you're looking to share or document the "select" sound effect from Garry's Mod You will need a tool like GCFScape to open VPK files