u/goaltender31

I am military and PCSing to JBLM. I am trying to figure out what firearms I can take with me.

There are a couple questions I would appreciate if someone could answer just to make sure I am above board.

1. ARs are universally banned or are grandfathered if purchased before 2023? Does the grandfathering apply if purchased in another state (prior to 2023)?
2. Are magazines purchased prior to 2023 and brought in from out of state grandfathered?
3. What the actual hell is a "22 caliber tube ammunition feeding device"? Are 'high capacity' .22 mags allowed or is this a specific magazine type?

EDIT: Thank you everyone for the answers!

My wife and i have our anniversary tomorrow and shes been trying to track down a good frozen marg place in Sandestin (Destin or adjacent areas are good too). Anyone have any recommendations? We've tried Crab Trap and Surf Hut but both meh. Bonus if the place has good mexican food​