Siege Breakers in Fortnite Save the World?

How do you get the world the legendary Siege Breakers (Scar) in Fortnite?

I actually would have thought that the (gray) crusher has to be upgraded with the sketch

Or you have to draw your own sketch for the Legendary Siege Breakers

Can you help me there 🤗

Gray, green, blue, purple, gold. These are the rarity values. You only get the Scar from purple. Before that, the whole thing remains an M4. Alternatively, you can also get them directly from the scrapbook.

Thank you