The absolutely scary part is, while mana spells definately hurt him, that armor can still be breached pretty easily. Even at character creation someone can take an assault rifle with EX ammo that reduces armor by 2, make it a HV weapon capable of firing long bursts, put enough recoil compensation upon it to negate the first long burst, make a called shot to boost damage by 4, and make an aimed narrow long burst capable of doing:
Base damage: 6
long burst: +5
called shot: +4
EX ammo: +1
total: 16
And that is not including the extra hits for damage. While it is possible to negate the damage completely with the roll, that is really unlikely. And that is just a starting character with a modified AK 98. Keep in mind that while damage resistance is pretty sweet, not getting shot is better still.