It makes a weak diversion. I wonder if the guns they had were legal?
Probably, doesn't look like its hard to get them
http://en.wikipedia.org/wiki/Gun_laws_in_OklahomaOklahoma is generally a gun-friendly state, and has mostly less-restrictive gun laws. Being part of the Southern United States and Western United States, Oklahoma is home to a strong gun culture, which is reflected in Oklahoma's gun laws.
Apparently you can sell them privately without any paper work.