Just don't ask your friendly acquaintance who is a LEO to buy and then re-sell to you - a couple Sac Sheriff deputies got in a bunch of trouble for that.
But if they no longer need or like something they bought, they may sell their handguns just like any other CA resident.
, Magazine Qs
, Knife laws
Unless there is some way to amend a bill so you would support it,
the details do not matter
until the Governor signs or allows the bill to become law.
Ask CA law questions in the How CA Laws Apply to/Affect Me Forum
- most questions that start 'Is it legal ...' go there.
Not a lawyer, just Some Guy On The Interwebs.