I try making NPC's that use the grenade launcher but for some reason the grenade never explode. They only shoot and you hear the shoot sound but no explosion.
In response to Goldie ():
If you read some of the old posts you will see that they cannot use rocket launchers , so the logic is that they will not be able to use grenade launchers either. Another thing to take into account is "what is the default ammo" for grenade launchers ?, With shotguns it is buckshot, if you try to give the bots "slugs" they wont use them even if equipped with a shotgun with slugs, So if the default ammo for grenade launchers is shotgun ammo they wont fire HE or smoke,
Only melee and regular projectile weapons are considered reliable.
Arrow/grenade/rocket weapons probably wont work, in some way or another.