Got the home defense thing covered. But Humvees are a bit slow and clumsy to suit me. There’s plenty of Big block hardware with heavy 4X4 mounting gear to start. And that pile of steel plate out back is easy to make decent body work. The only thing I might have to stock up on is welding rod.
Caliber-wise one needs to stick with stuff that can be had at the hardware store. Anything that starts with .30 is OK. Powered feeding takes a little planning but is not an actual problem either.
Small stuff
Big stuff
FWIW - We have about 1/4 of the US Strategic weapons home ported locally.
SpyNavy
Garde la Foi, mes amis! Nous nous sommes les sauveurs de la République! Maintenant et Toujours!
(Keep the Faith, my friends! We are the saviors of the Republic! Now and Forever!)
LonePalm, le Républicain du verre cassé (The Broken Glass Republican)