Perfect Dark

[final kaoss]

Unlimited falcon2 ammo
First, you will have to run out of falcon ammo, then press the B button and you will have one bullet, when you use it press B button again and you will have another bullet, you can do it the times you want and at any time during the game.

 

[final kaoss]

Take weapons
After you kill an enemy, walk over him and press Select to see if you can steal any weapons from them.