Piecing Mod Qustion

[Doforcash]

should i put an armor piecing mod on a armor ingor weapon, why ?

[Sagonene]

Yes, it counts as an element. Like adding fire damage or cold. It just does X% of your base damage. If your weapon does 10 points damage (armor ignore) and you use a 90% armor pierce, against a Grineer Uparmor Doombuggy you will do 10 + 9 damage.

If you use a non ignore weapon and the buggy's armor reduces damage by 50%, you would do 5 + 9.

And yes, this is oversimplified.