Just my opinion, but it’s going to get harder to find 40 in small carry guns in gun shops. 40s&w kind of hit the skids when the FBI said they were dumping it for 9mm. Many law enforcement agencies were dropping it prior to that, as well. It is the caliber that is most being moved away from in law enforcement use, mainly in favor of 9mm. With all the new self defense loads the 9MM 124 and 147gr is arguably as good or better than 40 with much less recoil, hence the moves. Don’t get me wrong, 40 is still a great round, but the recoil is almost as great as 45, so 9mm or 45acp are becoming the norms.