Ithaca produced a single barrel called a "Lefever Long Range and Trap" and Savage made the Model 219 and 220 both of which were single barrel break open guns with a tang safety and were hammer less. I have a 219 .410 I used to use for rabbits and a 220 16 gauge I'm waiting to give to a Grandchild. You can occasionally find both listed on Gunbroker.com.