Previous weapon

`Mouse wheel up`

All hotkeys for Counter Strike: Global Offensive

Movement Move forward	`W`
Movement Move backward	`S`
Movement Move left (strafe)	`A`
Movement Move right (strafe)	`D`
Movement Walk	`↑ Shift`
Movement Jump	`Space`
Movement Duck	`Ctrl`
Communication Use voice communication	`K`
Communication Standard radio messages	`Z`
Communication Group radio messages	`X`
Communication Report radio messages	`C`
Communication Chat message	`Y`
Communication Team message	`U`
Menu Buy menu	`B`
Menu Automatically buy equipment	`F1`
Menu Re-buy previous equipment	`F2`
Menu Display multiplayer scores	`⭾ Tab`
Menu Select team	`M`
Combat Fire	`Mouse left click`
Combat Weapon special function	`Mouse right click`
Combat Reload weapon	`R`
Combat Previous weapon	`Mouse wheel up`
Combat Next weapon	`Mouse wheel down`
Combat Drop current weapon	`G`
Miscellaneous Use items	`E`
Miscellaneous Take a screenshot	`F12`
Miscellaneous Inspect weapon	`F`
Miscellaneous Inspect weapon	`V`
Miscellaneous Report bug	`F4`
Weapons: Pistols Desert Eagle	`B` then `1` then `5`
Weapons: Pistols Dual Berettas	`B` then `1` then `2`
Weapons: Pistols P2000	`B` then `1` then `1`
Weapons: Pistols Tec-9	`B` then `1` then `4`
Weapons: Pistols 228 Compact	`B` then `1` then `3`
Weapons: Shotguns XM1014	`B` then `2` then `2`
Weapons: Shotguns Sawed-Off	`B` then `2` then `3`
Weapons: Shotguns Nova	`B` then `2` then `1`
Weapons: Submachine guns P90	`B` then `3` then `4`
Weapons: Submachine guns UMP-45	`B` then `3` then `3`
Weapons: Submachine guns MP9	`B` then `3` then `1`
Weapons: Submachine guns PP-Bizon	`B` then `3` then `5`
Weapons: Submachine guns MP7	`B` then `3` then `2`
Weapons: Rifles AWP	`B` then `4` then `5`
Weapons: Rifles AK-47	`B` then `4` then `2`
Weapons: Rifles AUG	`B` then `4` then `4`
Weapons: Rifles G3SG1	`B` then `4` then `6`
Weapons: Rifles FAMAS	`B` then `4` then `1`
Weapons: Machine guns M249	`B` then `2` then `4`
Weapons: Machine guns Negev	`B` then `2` then `5`
Equipment Zeus x27	`B` then `5` then `3`
Equipment Rescue kit	`B` then `5` then `4`
Equipment: Grenades HE Grenade	`B` then `6` then `4`
Equipment: Grenades Incendiary Grenade	`B` then `6` then `1`
Equipment: Grenades Flashbang	`B` then `6` then `3`
Equipment: Grenades Decoy grenade	`B` then `6` then `2`
Equipment: Grenades Smoke grenade	`B` then `6` then `5`