IZH 46M + San Francisco

[alfgold]

I live in San Francisco, Ca, and am planning to purchase an IZH 46M pistol.
The question: Has San Francisco banned air gun ownership just like some other cities such as N.Y.?
I went to my police station and brought up this question. But the officer on duty couldn't provide me anything in black on white, all he said was "forbidden".
I also talked to some local gun stores, and some gun club members, and they all said they've never heard of this ban (but then they only deal with firearms).
I then searched the following San Francisco municipal code and California law sites using key words like "pellet", "bb", and "gun". I found not one sentence about prohibiting possession witin the city.

Could someone help?

Many thanks.
Alfred Au

San Francisco code:
http://www.municode.com/Resources/gatew ... 4140&sid=5
http://www.sfgov.org/site/bdsupvrs_page.asp?id=27369
California law:
http://www.leginfo.ca.gov/calaw.html
http://ag.ca.gov/firearms/dwcl/53701.php