In this guide, you will learn how to unlock Custom Bullets (Explosive, Armor piercing, Incendiary and more) in Grand Theft Auto Online.
First of all, you will need to have a bunker, just the base property, there’s no need of any upgrade.

When you are in your bunker, you need to access a laptop and assign your employees to do some research. You have to spend a lot of money on speeding up the research and it would probably take 11 million.

After that, you need to acquire a gun workshop which will take more money. You cna find them in terabyte, moc or in the agency. Upgrade your gun upto mark 2 and then buy each custom bullet for each gun.
