Go to the console by pressing the ~ button and then use the "give" code and type the following items:

* weapon_ak47
* weapon_aug
* weapon_awp
* weapon_deagle
* weapon_elite
* weapon_famas
* weapon_fiveseven
* weapon_g3sg1
* weapon_glock18
* weapon_m3
* weapon_m4a1
* weapon_mac10
* weapon_mp5navy
* weapon_p228
* weapon_p90
* weapon_scout
* weapon_sg550
* weapon_sg552
* weapon_tmp
* weapon_ump45
* weapon_usp
* weapon_xm1014