I wouldn't either but I guess what I'm saying is that the liberal argument probably makes more logical sense overall, even though I don't know if I necessarily agree with it.
This is an interesting thing to bring up and I'm glad you did.
Because yes, obviously if guns are banned in the United States there would reasonably be a market of some size for firearms on the black market. You see this in European nations where guns are difficult to get but come larger criminal syndicates (Commorah, N'dragheta, etc) are able to get them, though it's worth noting that you don't really see guns used in street crime nearly as much in those countries.
However the situation now has guns so plentiful in the United States that not only are most guns which are used domestically in the commission of crimes former legal purchases, but organized crime groups in Mexico are literally trafficking weapons from the United States because it's cheaper and easier to do.
This huge weapons trafficking pipeline that flows through Mexico into the United States doesn't really exist.