Figured it out a few minutes after posting... oops

For anyone else that might ever want to do the same:
There doesn't seem to be a way to spawn live grenades in CS:GO. However you can create the necessary explosion effect with info_particle_system. Here are CS:GO's particles:
https://developer.valvesoftware.com/wik ... _Particlesexplosion_c4_500
explosion_c4_500_fallback
explosion_hegrenade_interior_fallback
explosion_hegrenade_interior_fallback2
explosion_hegrenade_snow_fallback2
explosion_hegrenade_dirt*
explosion_hegrenade_interior*
explosion_hegrenade_water*
* = in the game but not included in valve's wiki
Then you can attach an ambient_generic explosion sound and an a trigger_hurt or env_explosion to create the damage.
