Metal Gear Solid 5: The Phantom Pain has a currency system which is tied to every aspect of the game. From sending Snake on missions, upgrading Mother Base and developing weapons and equipment in Big Boss’s arsenal, it’s going to cost some cash. In order to keep you in the black, we have put together some tips and tricks to help earn GMP quickly and make sure you always have enough cash to buy the weapons you want, and to upgrade them when needed to complete the mission. How to save money on missions Before you even jump in the chopper, you get the chance to kit out Snake in an array of weapons, equipment and items. However, it’s worth noting that the more gear you pile onto Snake, the more expensive the mission becomes. In the bottom left of the screen, you’ll noti...