Mike Allen wrote:

Anyone found with a weapon that belongs to a lower caste
can be summarily executed.

I assume you mean "higher caste."

[Posession of a weapons about your clearance level is treason.]

Ouch, What I meant to write, but didn't, is this:

Anyone of a class lower than Freeman found with a weapon can be summarily
executed.

I hadn't thought of weapons clearances based on hierarchy. Hmm.

In fact that was traditional in Japan (for part of their history).  
Although a "middle-class" non-samurai could wear a sword, wearing daisho 
was an execution offense and so forth.  The heavy emphasis on the 
martial arts, implies that this Japan only allows guns to the military.