"One Gun A Month" laws are perhaps the dumbest pieces of anti-2nd Amendment legislation to come down the pike. Usually passed by knee-jerk reflex in the wake of some nutjob's rampage, they more or less ignore the fact that spree killers and mass murderers usually only use just the one gun to complete their grisly chores.
The Anti-Bill-Of-Rights crowd claims that they don't affect "normal law-abiding gun owners" (whatever that's supposed to mean,) in complete ignorance of the fact that the only group of gun owners they do impact is the one least likely to commit a crime: Collectors. Gun collectors are, on the whole, no more likely to go commit a violent crime than collectors of anything else, be it coins, stamps, or Beanie Babies. When they get a chance to buy two [Fill In The Blank: World War One Military Rifles, Spanish Pistols, Pre-1973 Ruger Revolvers] at a time from another collector or an estate sale, the last thing on their mind is a massacree at the local garden club meeting. Similarly, if some trenchcoat-wearing loser is going to act out his Marilyn Manson song fantasies, he's not going to be put off for a moment by a "One Gun A Month" law.
Admit it, these laws are what you politicians do instead of something.