This week's Fortnite challenges seem a lot more simpler than those of Week 9.
This one, which has you upgrade weapons three times, can be done quickly should you have farmed the necessary Gold Bars.
The easiest way to complete this one is to pay a visit to Kondor down in Misty Meadows, who is a guaranteed spawn.
Where to improve your weapons
Kondor patrols the eastern half of Misty Meadows, usually next to the large stone fountain. In addition to bounties and missions, he can upgrade your weapons.
The cost of upgrading your weapon will depend on its initial quality. Upgrading a common weapon will only cost you 25 Gold Bars, but upgrading an epic weapon to legendary will cost you several hundred.
Naturally, this means you should go with common weapons, to save on the cost.
Be mindful that things will get heated immediately upon landing. Farm up a weapon or two so you can defend yourself before you pay Kondor a visit!