I've purchased both a pinfire revolver and a British Bulldog. I ordered them both from (US) Gunbroker and they're being mailed to me. (These are lawful transactions in the US: cartridge guns made before 1899, along with air guns and blackpowder guns, are not considered "firearms" at federal law and can be mail-order sold and shipped between private individuals).
I'm going to decide which type I like the best, after I look them over, and then collect ONE type. Only one. That's the way I must make my mind operate: if I allow myself to collect both...well, next thing I'll also be collecting .22 single shot rifles, and derringers, and old shotguns, and....
Jim