My friends at the Bureau who keep up on firearms and tactics issues affecting them told me that the agency is seriously considering going back to 9mm (but staying with Glock) The reasoning they supposedly have are: 1. The difference (in their opinion now) in terminal ballistics between .40 and 9mm is minimal. 2. The 9mm is more shooter friendly (read: for females) 3. The 9mm is a lower pressure round which they feel may alleviate some recurring maintenance/breakage issues they have been seeing. Its very interesting but to be honest a lot of people right here and other forums who take self defense seriously have been stating this for a while. I don't have a problem with the 40 however I don't really care for the muzzle flip inherit with this round as I like to get as many rounds on target as quickly as I can. I tell a lot of people who ask me, the following: get the biggest round in the most reliable gun you can become proficient in and train, train, train. 9MM is a very good defensive round Wanna kill these ads? We can help!