[weby]

Soft ballistic armor works a lot different in real life than in Gurps. In Gurps armor reduces damage by a given value and thus the object on the other side takes less damage. In real life soft ballistic armor that fails to stop a projectile will tend to "catastrophically fail" at the location of the penetration and not slow down the projectile much thus it would hit a second such panel with most of it's energy left. Only if the penetration is really marginal can we see a large slowdown but penetration like the Gurps armor model.

To model the real behavior Gurps you would need to give such armors a fairly high "penetration value"(PW) and really low(or no) DR. The PW would then be compared to the damage and if damage was less then no penetration happens and blunt trauma is applied. If the damage was more then only the minor DR is applied and the resulting damage is applied to the object protected or inner layer armor. If doing such penetration value thing it would likely make mostly sense to use armor as dice type thing for the PWs and express them in dice of damage and not damage values.