Another suggestion would be to simplify Armor Piercing as well using simple attack bonuses, possibly as follows: "Any weapon with this property applies a +1 bonus to attack rolls against a target wearing heavy armor."
As it stands, Armor Piercing appears to just be a +1 to attack rolls...
Wonderful Rules
Well done! I'm running entirely low-level games currently, so I appreciate the weaponry more than the paragon paths, but they seem very well crafted.
I think the Inaccurate weapon attribute seems unnecessarily complex. You can get the same effect from tinkering with the...