How do you unlock all the weapons in black ops?

Answer 1

To unlock all the Call of Duty Black Ops weapons you must do numerous things. First, you have to rank up in order to purchase the weapons. Next, you must purchase the weapon with your COD points you gained in-game.

There are some classified weapons that are available in the menus. To unlock that specific weapon for purchase, you must purchase all the weapons in that category in order to purchase that weapon. Example: There are 4 snipers and one is classified. Purchase all 3 snipers and the last one will be un-classified.