Just a quick response as I expect such responses after the pro .30-30 posts.
1- Outfit with a basic defensive firearm .30-30, SKS, 12 gauge, etc.
2- Take care of other more important survival purchases
3- When your budget allows upgrade to better defensive weapons
4- Don’t let ownership of exotic/military utility weapons make you believe you are a SEAL  (the point of the .30-30 post)
Unless defense is the most pressing danger, then don’t sink your whole survival budget into guns if you can already accomplish that mission with existing arms. Most of us enjoy firearms and we are always tempted to justify a new firearm upgrade instead of the boring grain mill and basic shelter type stuff. – David