From what I have been able to find, metallurgy was developed relatively late in MesoAmerica, and seems to have focused on silver, gold, and copper . They also worked with alloys. Obsidian and copper were more prevalent components of the weapons you mention. They may have had exposure to iron gathered from meteorites.
Source(s):
http://people.uncw.edu/simmonss/The%20Maya%20Archaeometallurgy%20Project.ht..., http://en.wikipedia.org/wiki/Metallurgy_in_pre-Columbian_Mesoamerica, http://www.precolumbianweapons.com/, http://en.wikipedia.org/wiki/Aztec_warfare#Equipment, http://en.wikipedia.org/wiki/History_of_ferrous_metallurgy


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