California Legal Options
Currently, California residents can only buy a "featureless rifle" as defined by California Department of Justice rules. But, we can configure our MGA Mk46 as a "featureless rifle". This configuration requires a fixed stock, muzzle brake, and grip wrap. Moreover, CA has attempted to make an outright ban on belt-fed rifles at least twice, and may try yet again soon.
This is an example of a base model California-compliant "featureless rifle":
The MGA Mk46 (CA-config) is also available in a loaded model with various upgrades and extras: