As Rob has explained, I believe the only thing the June 30 date does is state when a person would no longer be eligible to keep their firearm. They would not be eligible for grandfathering after July 1. Nothing affects the current classification of the firearm or the anticipated or proposed classification of the firearms that are in the act. The only thing the June 30 date does is trigger eligibility for grandfathering. It does not affect the classification of the firearm. The June 30 date does not relate to classification.
On June 7th, 2018. See this statement in context.