Sportsman's Outdoor Superstore
Geoff, we can convert most AR-style guns to be CA Compliant, including this M&P15 Sport. In order to do that, we would switch out the 30-round magazine with a 10-round magazine and install a Bullet Button magazine release. The Bullet Button and installation would be a $20 charge.
If you have an interest in purchasing this rifle, our customer service team would be glad to assist you with that. Please let us know if you have any other questions. Thanks!