I'm pretty sure this guy knows all about the importation/AV thing as he attended a game with Tyson and others just the other day.
As for how durable it is, well really depends how you run it.
More you use it the more wear it creates like in most things. If you abuse it and miscare for it, well I am sure you can figure out the rest.
I've personally been eye balling my wallet hoping for some money growth to get the KA FN FAL in my collection, from what I have heard it's pretty decent.
Check out Youtube for some reviews, they can go into more detail
After watching ~10 reviews, see if they answer your questions.
If anything is unclrear after those ~10 odd reviews, I would then poke back to here and see if somebody can help you.
Best of luck.