The Santa Fe City Council is currently considering an ordinance that would ban the future possession, sale or transfer of any ammunition feeding device that accepts, or can be readily converted to accept, more than ten rounds.
http://www.examiner.com/article/santa-fe-city-council-considers-magazine-ban-city-different
Now according to Wiki New Mexico has preemption: http://en.wikipedia.org/wiki/Gun_laws_in_New_Mexico#State_preemption
The question would be is how the heck the city thinks they are going to get around this, or are they going to try and say preemption only covers firearms and not magazines.