Realisticly at least 20+ depends on the specificity of the firearm laws in terms of weapon classification in his state and if they are going to bring a federal case as well.
For example what my state calls an assault weapon the ATF does not. The article doesnt give many details. If he was in posession of unregistered NFA type weapon and said capacity magazines are not legal in NJ along with the paperwork issue hes gone be gone along time.
Unlawful posession of a firearm is at minimum 10yrs IIRC so alot of it depends on the details.
03 ZX12r - Cosmic Red ( Dont be fooled, shes purple)