The physics_pistol_mod.zip file you have requested: Garry's Mod / SWEPs / Half-Life 2: Pistol Gravity/Phys Gun Mod For Garry's Mod - 393.57kb 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 changes the graivty gun and phys gun in Garry's Mod to the pistol shown in the screenshots below. This is in mod form.