Would building a derringer barrel chambered for 410 shot shells be legal ?
I just bought a used Bond Arms derringer and after looking at the simple arrangement for the barrel attachment and locking lug I believe I could easily make a 410 barrel to fit .
I know that other handguns that are chambered to fire 45 Colt and 410 shot shells have a rifled 45 cal. bore and are not made specifically for firing the 410 shot shells.
If I were to build my own barrel and make the bore .410 smooth bore and the chamber correct for 2 1/2” shot shells would this make it illegal as in a short barreled shotgun or are their other considerations ?
Jedman