Section 30605 does not apply to the possession of an assault weapon by a person who has possessed the assault weapon prior to January 1, 2017, if all of the following are applicable:
(a) Prior to January 1, 2017, the person would have been eligible to register that assault weapon pursuant to subdivision (b) of Section 30900.
(b) The person lawfully possessed that assault weapon prior to January 1, 2017.
(c) The person registers the assault weapon by July 1, 2018, in accordance with subdivision (b) of Section 30900.