I'll repeat what I said before.
I've followed the trend of introduction of a myriad of look-alike, toy-like, CO2 air pistols. Noe to my knowledge have a threaded barrel. I suggested to sign on to YouTube, and bring up Andy's Air Gun Review. Over the last few years, he has reviewed ALL of these toy-like guns. Only one of them has peaked my interest, but it wasn't (isn't) CO2 powered. Rather it is a pump up gun. And it does not have a threaded barrel.