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Your mods are without a doubt some of my favourites on the entire workshop.
To edit existing .gro files,you can find your subscribed workshop items in Steam\SteamApps\common\Serious Sam 3\Temp\Workshop\41070\Subscribed
The archives are all numbered, so you may have to search for it a bit. The weapon mod is 49.657KB large, that should help you locate it.