Something showed up in Harry Potter and the Natural 20 (a HP & D&D 3.5e fanfiction) and I was wondering about application in pathfinder: When wielding a two handed reach weapon (or 1 handed with shield), can you can use armored spikes to make Attacks of Opportunities against foes nearby?
The Reach quality for weapons only specifies that you "can't use it against an adjacent foe." And the Spiked Armor quality specifies that you can use it as part of a grapple, or as a separate attack.
Edit: Just finished that page of the HP fanfic, and it mentions a note at the end that the above technique doesn't work in pathfinder according to an FAQ. However, that's after the entire D&D tip section, so it could be referring specifically to using a two handed weapon and TWF abilities to wield the armor spike as an offhand weapon. Bonus: does anyone know what FAQ is being referred to?