That's a very good question.
Thing is I'm not sure how. All the weapons are automatically given to you when you start up Gmod. You can hold all the weapons basically.
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On the 360 you just have to pick up a enemy's weapon.
the only way you can drop a weapon is if you pick up another weapon to replace it.
no. gmod is only for the pc.
No. Gmod is only for PC
steam/steamapps/username/gmod/gmod/data/adv_dup(or something like that)/* *place dupe .txt file or file folder with dups in it, here)