Grand Theft Auto: Chinatown Wars Command codes

Weapon Set 4
Enter this code at any time during single player mode (not on a pause menu) to get weapon set 4:

R, Up, X, Down, Left, R, X, Right

Weapon Set 4 includes these weapons with maximum ammo:

Flashbang Grenade, Baseball Bat, Pistol, RPG, Carbine, Micro SMG, Stubby Shotgun