1. sniper scopes, or night vision scopes, are banned in the state of california. you can look this one up, i am certain of this. it's in the same category as cane swords, shuriken, and pepper spray over 2 ounces. possession is illegal (unless maybe grandfathered); that is why companies like cheaperthandirt will not sell ATNs to CA.
2. armor piercing ammo is such a stupid, f-ed up subject in cal that I'm not going to go into details about it on a public forum. suffice it to say that there is a ban on AP, whatever that is, and that the looseness and military incorrectness of the state's AP definition would render nearly every shooter a felon. i will also say that green tip ss109 is not AP. Black tip IS.
3. magazines. don't get caught with an "LEO ONLY" marked normal cap.
4. loaded magazines are a no-no. magazines in the magazine well are a no-no. fuzzy area on #2, but in the HSC book it is expressly forbidden.
5. etc: many things, but one example - it is illegal to have any ammoin the same container as a firearm. so if you have 1 9mm in the case, you are doing something illegal. it is fuzzy concerining ammo in pouches in the same case or on the outside of the case.