AOC

Totally not advocating violence but have you looked into PCP rifles (or handguns). They are not the air rifles of my childhood, they are quite impressive. Most importantly they aren't considered firearms so you can get them in lots of flavors (single shot, semi auto, full auto) mailed right to your door. Lots of calibers to choose from (I think I've seen a couple .72 caliber out there), but I'm a fan of small calibers for the cost (500 shots for around $10 if going with cheap 14.3 gr pellets).

My current favorite is an air venturi avenger in .22 caliber. I get around 40-60 shots between airing it up, I used a hand pump for a few months but could never get much above 3,000 psi, with a relatively cheap compressor I get it up to around 4,300 psi (4,300 is the max for mine, I usually stop it a little shy).