I find this rather funny. As explained by Brennan B. on the gun.mail discussion from work yesterday:
For anyone who’s been lusting after a handgun that’s not on California’s “safe” list, a new workaround for that infernal list has recently surfaced.
Basically it involves converting the handgun into a single-shot with overall length >10″ in order to qualify for the target pistol exception to the handgun list. Then it can be legally sold to you. Once you’ve completed the paperwork and waiting period it’s your gun, at which point you can legally hire a gunsmith to change out the clowny-looking ~8″ barrel back out for a standard one, and un-pin the 0-round magazine from the frame. Then you can sell those parts back to the shop that did the single-shot conversion.
Note that this work can be done in-state which means the gunsmith hired to do the conversion, the FFL from which you buy the gun, and the gunsmith that converts it back can all be the same guy.
Prohibition of things doesn’t work. It doesn’t matter what you are trying to prohibit. You can only punish actions.