You can also port the rule from shadowrun - making called shot to bypass armour - shooting in unprotected areas, like face etc.
The rule would state that you can take penalty to lower target armour. -10 penalty for decreasing the armour by 1.
Also I would like to see shots in the head deal more damage. We houseruled that hits in the head deal 2 more damage, and hits in the body 1 more damage. Grimdark deadlines all the way. **** train has no breaks etc
Yes, but shadowrun did that with a penalty depending to the armour you try to bypass. And that penalty was horribly high at armour where it made sense.
I think it would better to offer a called shot to halve the armour value (rounded up) at the given location.