How does it work? If a perm weap gets to 0% then it's broken or no?
If not where?
I guess with Durability decreasing, your weapon stats also decrease, till 0% where the weapon gets to the minimum stats it can reach (which are not 0).
If you ask for Expendable system, you buy a lease weapon, and after a certain number of games (not timed) it expires, which I think is better than the timed system, so you can actually stop playing the game for some time and then come back with no fear of your weapon get expired as time goes..