Hushed Casket points out that people who purchased Rainbow Six Vegas 2 from Best Buy were given a code to unlock a free gun in the game. The thing is the code was printed on a sticker on the outside of the game. Better still it can be used by anyone who owns the game.

To unlock the gun go to the main menu of the game and do the following:

(Hold RB) Down, Down, Up, Up, X, B, X, B, Y, Up, Up, Y

This is almost as good as that free Comcast map.

Rainbow Six Vegas 2. Free Best Buy gun code [Hushed Casket]