A client of mine recently brought to my attention the fact that there is an exception in Florida Statute 706.06 for Machine Guns as defined in Florida Statute 790.01(9).
790.06(1) states that:
For the purposes of this section, concealed weapons or concealed firearms are defined as a handgun, electronic weapon or device, tear gas gun, knife, or billie, but the term does not include a machine gun as defined in s. 790.001(9).
So next time your traveling with a machine gun in Florida, make sure its not concealed.