To insert the following codes, enable the console from the in-game options. Press ~ and type in "seta thereisacow 1337", pressing Enter thereafter. From here, type "spdevmap bog_a" and press Enter again. Then, you can insert the following cheats.

cg_drawgun - Drop your gun
cg_fov - Zoom with any gun
cg_LaserForceOn 1 - Laser site with any gun
demigod - God Mode (with shaking screen)