first type this in console, then select knife you like and type in console
↓
sv_cheats 1
mp_drop_knife_enable 1




Flip Knife:
give weapon_knife_flip;ent_fire weapon_knife addoutput "classname weapon_knifegg"

Gut Knife:
give weapon_knife_gut;ent_fire weapon_knife addoutput "classname weapon_knifegg"

Bayonet:
give weapon_bayonet;ent_fire weapon_knife addoutput "classname weapon_knifegg"

Karambit:
give weapon_knife_karambit;ent_fire weapon_knife addoutput "classname weapon_knifegg"

M9 Bayonet:
give weapon_knife_m9_bayonet;ent_fire weapon_knife addoutput "classname weapon_knifegg"

Huntsman:
give weapon_knife_tactical;ent_fire weapon_knife addoutput "classname weapon_knifegg"

Butterfly:
give weapon_knife_butterfly;ent_fire weapon_knife addoutput "classname weapon_knifegg"

Falchion:
give weapon_knife_falchion;ent_fire weapon_knife addoutput "classname weapon_knifegg"

Shadow Dagger:
give weapon_knife_push;ent_fire weapon_knife addoutput "classname weapon_knifegg"

Bowie Knife:
give weapon_knife_survival_bowie;ent_fire weapon_knife addoutput "classname weapon_knifegg"

Ursus:
give weapon_knife_ursus;ent_fire weapon_knife addoutput "classname weapon_knifegg"

Navaja:
give weapon_knife_gypsy_jackknife;ent_fire weapon_knife addoutput "classname weapon_knifegg"

Stiletto:
give weapon_knife_stiletto;ent_fire weapon_knife addoutput "classname weapon_knifegg"

Talon:
give weapon_knife_widowmaker;ent_fire weapon_knife addoutput "classname weapon_knifegg"

Skeleton:
give weapon_knife_skeleton;ent_fire weapon_knife addoutput "classname weapon_knifegg"

Nomad:
give weapon_knife_outdoor;ent_fire weapon_knife addoutput "classname weapon_knifegg"

Survival:
give weapon_knife_canis;ent_fire weapon_knife addoutput "classname weapon_knifegg"

Spectral:
give weapon_knife_ghost;ent_fire weapon_knife addoutput "classname weapon_knifegg"

Paracord:
give weapon_knife_cord;ent_fire weapon_knife addoutput "classname weapon_knifegg"

Classic:
give weapon_knife_css;ent_fire weapon_knife addoutput "classname weapon_knifegg"

Golden Knife:
give weapon_knifegg;ent_fire weapon_knife addoutput "classname weapon_knifegg"