Equipment and ammunition is in short supply in Metal Gear Solid Delta: Snake Eater and you will have to rely on your wits and stealthiness to get through most of the game. Even so, there is a way to have infinite ammunition at your disposal.
This guide for Metal Gear Solid Delta: Snake Eater is all about unlocking access to limitless ammunition for all of your guns.
Infinity Face Paint Effect
All of the camos and face paints have a unique special effect, and the Infinity Face Paint is what you will need to equip to unlock infinite ammo.
Unlock Infinity Face Paint
To unlock Infinity Face Paint you will have to complete the game on any difficulty with a live Tsuchinoko in your possession. This is easier said than done, but is best accomplished on Very Easy mode with the EZ Gun and its own unlimited ammo supply.
You will first encounter the Tsuchinoko in the vicinity of Ponizovje Warehouse. Lay down mousetraps here and check them periodically for whatever they may have ensnared. You can collect an additional mousetrap within the warehouse itself. Once captured, proceed with your playthrough.
At some point later on in Tikhogornyj, you will have the opportunity to recapture the Tsuchinoko using non-lethal methods. Do so, and carry on playing this run to completion with a live Tsuchinoko in your inventory, in order to unlock the Infinity Face Paint for your collection.
Below is a video that shows you exactly what needs to be done:
That is how you can unlock unlimited ammo for all weapons in Metal Gear Solid Delta: Snake Eater.