[Eric in the Ozarks]

My .50 is a single shot airgun. The .50 is actually .495 round ball. It uses a scuba style air tank to fill the system, providing four shots. It has about 850 fps and a goodly volume of footpound energy (penetrates a 1/4 inch pine board.) I’m not interested in trading it.

[mamelukesabre]

Technically, an airgun is not a “firearm”. So you’re safe. Who makes that thing anyway, and how much do they run?