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No, but you can Choose your Camo, and attachments
You get kills with the gun you want to unlock attachments for. If you see your challenges it will tell you what to do to unlock the attachment.
Like with any gun title, you must unlock all the attachments for it.
No, you must have the attachment already unlocked
No the acutal damage doesn't increase. When the gun levels up it's just for unlocking attachments, gun perks, and camos.
Depends what gun right... Pistols have red dots, holographic, grips, silencers, akimbo, FMJ and maybe some others...
no
only if you have a perk called bling. It lets u have 2 attachments on your secondary or primary gun
Here's a link to the Call of Duty: Modern Warfare 2 Wikipedia. Read carefully and click links to learn about all weapons and attachments. http://callofduty.wikia.com/wiki/List_of_Weapons_and_Attachments_in_Modern_Warfare_2
Its an assault gun
my is the MP7 and the G36C
the g18