...and there's no liberal nearby to be affronted, is a crime committed?
Apparently not according to police stats which note that right next to nobody has been arrested for selling a gun to another citizen in a private sale without a background check. The absence of cops at the scene of the transfer, or even a liberal to call one is probably a significant factor in the lack of arrests.
The other law that has netted no arrests is the magazine capacity law which says that you must either buy standard capacity magazines at gun stores in outlying states, or get them from the same fellow who sold you the gun. And we all know that no one in the scrupulously law-abiding state of Colorado would drive to Wyoming to buy anything not permitted here. Like fireworks.
Bottom line, neither law will work without 100% registration and would also require someone at every gun range in the state, formal or informal, to run numbers on registered guns and magazines.
The next recall election is November 4th.