Strangely the spas-12 doesn't work (it shoot but it don't do damage to the mobs)

bruh

Works fine for me. What ammo are you using?

12 blue gauge

Standard ammo works on my end, could you describe the situation more? What are you shooting at, what range are we talking about, do you hear ricochet sounds when shooting at the floor at a shallow angle, have you tried any other ammo types?

What???

you posted the file path from your hard drive instead of the video