I can't kill NPCs with certain weapons

If I try to kill a human or combine npc with a shotgun, pistol, sub-machine gun, or combine assault rifle. All my drivers are up to date, I have no viruses, and I have direct x level 9 graphics card. HELP

turn off sv cheats maybe?

no cheats are enabled.

Do you have npc controll?

I don’t have anything downloaded.

i had this problem for a while… but i had to reinstall gmod for another reason and it fixed this

I tried already. It doesnt work.