What about nations that ban guns but have higher homicide rates than Japan or even the U.S.?
The only countries that fit this definition outside Central/South America and Sub-Saharian Africa are Russia, Myanmar, Papua New Guinea, Palau and Kiribati.
Literally all of Europe and all of Asia with a functioning democracy have a lower homicide rate than the US. I wouldn’t really call that “cherrypicking”.
Is that what you’re comparing to? You think the US police would be as bad at enforcing a gun control law as the one in Kiribati?