For a home defense gun get a Red Dot or Holo. ( an Aimpoint or EOTech, not a "blue light special."
They would we superb for TEOTWAWKI as well.
History fails to record a single precedent in which nations subject to moral decay have not passed into political and economic decline. There has been either a spiritual awakening to overcome the moral lapse, or a progressive deterioration leading to ultimate national disaster.
If you think a strong military is expensive, think about what a weak one would cost