This is a quick guide explaining how the Custom Kit feature in Tarkov Arena works. I absolutely love this Arena update, but it is a little confusing at first. One Thing I didn't mention was purchasing new attachments. It only costs a few thousand rubles to purchase any of the attachments, and they are locked behind leveling just like the guns are. Also, it seems like the guns level up like in Call of Duty, meaning that if you want a new grip for your M4, you need to play games using the M4 to unlock new attachments for it.
How is your wipe going? Let me tell you, your wipe would be 42% better, at least, if you joined the new community discord server! (YT won't let me post a link in the description, so see my community post)