Originally Posted by starsnuffer
Epoxy is for the tinfoil hat crowd. There's no definition of permanent. Mag blocks installed are fine.
Since you'll be using these as a "fixed magazine rifle" with the addition of a bullet button, you're doubly fine. You don't have to epoxy the end on your shotgun magazine for the same reason.
Setting aside the tinfoil, the CA DOJ does rely on definitions from the Federal ATF (IE- definition/classification of muzzlebreaks vs flash hiders, etc). Permanence is defined there, even though it is not expressly stated in CA law.