You can loot them off bodies by searching (A). The can also be picked up off of the ground with "A"
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the only way you can drop a weapon is if you pick up another weapon to replace it.
Swing the nunchuck down and up while over the desired gun.
you simply press the q and e keys until you get the weapons you want. To pick up weapons, just walk over them. Picking up two of the same weapon means more ammo for the first one.
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.
press the little button on the top of the controller then it the green light will start to spin and then press the small button on the xbox and it will pick it up