Nothing in the game is permanent except for the default guns, but you still have to buy attachments for them, which also are not permanent.
It's why I quit playing. Not to mention all the hackers and "legit modders."
I laugh at Nexon's attempts to thwart hacking.
The game isn't fun because of the idiotic community, and the stupid channel/servers.
I couldn't go to any place for my rank that met my skill because my k/d was somehow hopped up to 1.40. so I ended up getting it lowered to like, 1.00 after hanging around with people at least 5 ranks higher.