33.3 Tactical is making something really cool for the gun lovers of California. Called the Calcatch which is simply a ” bolt on” design, no need to modify your receiver or risk ruining it trying to file down or drill holes.
from the site
33.3 Tactical has created a complete BOLT ON CA Compliant device for any milspec AR-10. The kit secures the magazine to the device ensuring it is compliant with CA law. It features a modified bolt catch & mag clip (the CalCatch) and the back end kit which contains a cam pin, wavy spring and an aluminum back plate. The backplate comes with a set screw and a QD mount as well as the option of a sling mount.
For full details, specs and how to purchase CLICK HERE