Are you willing to get into a PCP one?
Geez... RAT-A-TAT-TAT A RAT...?
Just go for one of these.
https://www.airgundepot.com/hatsan-blitz-full-auto-pcp-air-rifle.html
or this
https://www.airgundepot.com/umarex-steel-storm-bb-gun-air-pistol.html
All full auto....
Machine gun maybe??