Weapon in question, the psycannon hit a leman russ on the front.
Str 7 vs armour 14, i rolled a 6, allowing the rend, then rolled a 6 for the extra, giving me a total of 16 for a penetrating hit, i then rolled a 6 on the damage table. (much bs was had with dice in that game). The other part of rending rules was that if you rolled a 6 it became AP 1 or 2, (don't recall exactly).
Now, i think that the idea of it becoming the low AP was just for against non armoured models and as such it does not get a benefit to tank penetration damage rolls, but i just wanted to check. Otherwise i would've blown the tank up instead of immobilising it.
These aren't current rules anymore, so you might have a hard time finding an answer to this
If memory serves, the AP was solely for against infantry as it was based on a "to wound roll" not an armour penetration roll.
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