Main guidelines for it...
As long as the pistol version has a maglock + 10 round or less magazine, it is CA legal.
Attaching a vertical forward grip is a no-go (Federal felony), unless you have approval from the BATFE NFA Branch to make an AOW.
Attaching a shoulder stock is a no-go (Federal & state felonies), unless you have approval from the BATFE NFA Branch to make a SBR and have a valid CA DOJ BOF Dangerous Weapons Permit for a SBR.
As long as the pistol version has a maglock + 10 round or less magazine, it is CA legal.
Attaching a vertical forward grip is a no-go (Federal felony), unless you have approval from the BATFE NFA Branch to make an AOW.
Attaching a shoulder stock is a no-go (Federal & state felonies), unless you have approval from the BATFE NFA Branch to make a SBR and have a valid CA DOJ BOF Dangerous Weapons Permit for a SBR.

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