I'm sorry to hear that but read below.
978.32 Processing Times
(a) The time standards for processing assault weapon registration applications are as follows:
(1) Within 30 days after the date of receipt of an application, the Department shall either inform the applicant, in writing, that the application is complete and accepted for processing, or return the application as deficient and specify what information is required.
(2) Within 75 days after the date of receipt of a completed application, the Department shall complete the processing of the application.
(b) If the Department fails to meet its time standards for processing an assault weapon registration application, the applicant, within 30 days from the date of the notice of the final decision granting or denying the registration, may apply in writing for a full reimbursement of any and all registration fees. The Department shall respond within 10 days of receipt of a request for reimbursement. If the reimbursement request is denied, the applicant may appeal the denial, in writing, directly to the Attorney General. The appeal must be filed within 30 days of the date the applicant was notified of the reimbursement denial and shall set forth a concise statement of facts and chronology of events regarding the application. Following any investigation of the matter which the Attorney General deems appropriate, and within 30 days from the date of receipt of the appeal, a decision shall be issued. The appeal shall be decided in the applicant's favor if the Department exceeds the maximum time period for the processing of the application and the Department has failed to establish good cause for exceeding this time period. Information regarding this appeal process shall be included with all assault weapon registration application forms.
NOTE: Authority cited: Sections 15376 and 15378, Government Code. Reference: Sections 15376 and 15378, Government Code.
I copied it from [url]http://caag.state.ca.us/firearms/regs/sb23.htm[/url]
You have tough decision to make. As of now, you are committing a felony.
1) Take it to the police station and surrender your gun for disposal. Call them first and make an appointment! Don't walk in there with AR15 without letting them know first, they'll kill you on the spot.
2) Sell it to someone out of state.
3) Sell it to a gun dealer in your area who possess assault weapon permit.
4) Move the gun from the state and have your out-of-state friend, or relative hold on to it.
If you can afford it, you can even rent a storage place out of state (i.e. Nevada, Arizona) and keep the AR15 there.