Credits are the in-game currency system where you can buy weapons and attachments without unlocking them by ranking up. You earn credits by ranking up or by getting XP or by buying them with ROBUX. There is no other way to earn credits for those who *DID NOT READ*
The amount of credits you get when ranking up increases as you level up in ranks. (200 + 5*rank)
Example: Ranking up to rank 7 gives you 235 CR.
The price of weapons lowers by 200 for each rank away from unlocking a certain weapon. (1000 + [200*(rank needed) - 200*(your rank)])
Example: It costs 1800 CR to instantly unlock a rank 10 weapon at rank 6.
Attachment prices vary on the amount of kills needed to unlock an attachment. (200 + [1*(kills needed) - [200 + 1*(kills with weapon)])
Example: Having 56 kills with a weapon lowers the cost of a 120 kill attachment to 264 CR from the initial 320 CR.
(THE PRICE IS NOT SET BY A "DIFFICULTY" FOR UNLOCKING A WEAPON OR ATTACHMENT)