I have yet to see a coherent argument that an AR-15 with a 30 round magazine is necessary to run a family farm.
As for hunters, the $10 background check fee tacked on to the price of a new deer rifle or shotgun is insignificant. Especially considering that most of these weapons will outlast their owners.
It does however affect the militia movement. Rural areas have more rednecks that are arming themselves to fight the evil muslim communist black man in the White House and win America back for Christianity and the white race.
It also invokes the paranoid conspiracy theories at the core of the gun lobby argument. Let the damn liberals register your guns today and tomorrow the jack booted government thugs will break down the door and confiscate Grandpa's shotgun.
The sad part is that rural Colorado is catching the same disease that afflicts Kansas. Politicians in counties where the majority of real income comes from Social Security checks and farm subsidies complain about government interference in the free market. They don't notice that the paved roads in their county are mostly funded by gas taxes collected in the urban areas. Or the state programs that prop up rural health clinics and provide internet access for the local schools and the town library.