The quake_shotguns.zip file you have requested: Garry's Mod / SWEPs / Garry's Mod: Quake Shotguns Pack - 3.19mb is not available. Perhaps try browsing all files for the game Half-Life 2 and upload any files you want to share or are missing. This is the only information we could locate:
This is a small swep pack that contains the shotguns from Quake 3 and 4. Enjoy.