How do you unlock Reyes rebel scrap in escalera general store?

To unlock Reyes' rebel scrap in the Escalera General Store in "Far Cry 6," you need to complete the mission "The Legend of 67." After finishing this mission, you will gain access to the store, where you can find the rebel scrap. Make sure to explore the area thoroughly to collect the scrap, as it can be used for upgrades and crafting.