Yes, you could have kept your toys by renting some space and opening up a air gun museum.
I have one for you, not old but it shoots a 9mm BB using air I fill from a scuba at 3000psi. The velocity is pretty similar to a 9mm handgun too! It's about as loud as a handgun as well, not "stealthy" at all.
http://www.airgundepot.com/big-bore-article.html