I keep seeing posts that people who own a Glock 32 in .357 Sig can buy a conversion barrel to make it into a 9mm. Basically, two guns in one for a few extra dollars.
Can the opposite be accomplished. Can you put a .357 conversion barrel into a Glock 19 (9mm) or 23 (.40 S&W)? If not, why not? Is it the increased pressure of the .357 round?