Introduced in update 3.2.0 (September 27, 2017), the components system was introduced for the Inquisitor, Kumiho, Haechi, Bulgasari, Strider, Spectre, Scourge, Tempest, Shocktrain, Ember, Hover, Storm, Gust, Arbalest ,Redeemer, Dragoon and Vortex. This means that in order to get any of these robots or weapons, a player must have 10,000 components of that item to be able to buy it (and its default weapons). It is also important to note that buying a robot or weapon with components, it will only use 10,000 of them, leaving the others intact and ready to use to buy another robot. For example, if you have 13,880 Scourge components, it will buy the Scourge and only that item, and you will have 3,880 components left since it only uses up 10,000 of them. This also means that to buy another Scourge, you only need to get 6,120 more in order to get another one.
To get the components needed for the robot or weapon, you need to use the Black Market to obtain the items, or you can manually buy the components for real money, in the form of in-app purchases. Once you obtain 10,000 components of that item, you can press the "Buy" button and it automatically buys the robot or weapon for you if you have enough components for that item.
Components do not mix. This means that if you have a total of 10,000 components (2,700 Inquisitor components and 7,300 Kumiho components), it won't buy a random robot or weapon out of these components. They also cannot be traded or swapped for another one. This means that one Haechi component cannot be swapped for a Bulgasari component, even though they are similar in hardpoints and robot types. To buy a robot with components, you must have 10,000 components of a singular robot or weapon, not a mix of them.
Note: Even though these robots need components to build, they still need silver to upgrade, just like all other robots.