The information presented in this infographic is misleading and quite simply, wrong. The editor that approved it for publishing should be reprimanded for poor performance, as should your fact checkers (assuming any of those positions exist).
The chart does not include all the arms seized by Mexican law enforcement. It lists only those reported to the ATF, which, by Mexican admission, is a small number of the total arms seized. There is no hard data on the source of all firearms used by Mexican gangs. There is no hard data on the number of arms seized. A simple Google search will turn up sources for this info. Please do your homework. Please publish your references. Otherwise, don't publish.