A Yugo SKS is legal in CA only if you remove the grenade launcher and replace it with a lookalike brake. If you change any parts on it, you gotta comply with the 10 or less game. I think its BS and would never comply regardless. Just don't get caught at the range...
check out www.sksboards.com/smf for all your SKS needs.
check out www.sksboards.com/smf for all your SKS needs.