O.K., so tell me, after you unlock every attachment for a weapon what does Max lvl do for you?? Does it make it more power, steadier etc..

Or is it just some yellow bar that says "Max Level Achieved" for you see over your weapon when you go to customize it?

Just to tell you it's maxed out so there's no more unlocks/achievment points left for it.

but what achievements once you have all the attachments? I have all on certain guns and they are still not maxed out