Two firearms trade associations are asking for a preliminary injunction to block California's microstamping law.

The National Shooting Sports Foundation and the Sporting Arms and Ammunition Manufacturers' Institiute call the law, which requires manufacturers to laser-engrave make, model and serial number on two parts of each handgun including the firing pin, unworkable.  

Both groups say there is no existing microstamping technology that allows it to be done.  

Smith & Wesson and Sturm Ruger have already said they won't sell new guns in the state because of the law.