It’s good to know that you have a tool to defend your home.
What sort of paperwork and delay is involved for you to buy a rifle, for example this Howa 308
http://www.thecountryman.com/howa-stainless-sporter-308-black-hogue-rifle
How long it takes depends on how efficient the local police are - usually a month or more. Very tardy compared to the US!