I registered this gun during the late 90s assault weapons ban. Was told I couldn't modify anything but the stock. Every part of my sks has a matching serial number including the magazine. The way I took it when they explained it to me I couldn't even change the magazine for larger or smaller and modifications to the magazine wasn't allowed at all during that time. Right now I don't know what the law is here in california but I'm going to check on that. But I still want a bolt action for shots farther out then the sks can deliver.