I bought a Lone Wolf 40-9mm conversion barrel for my Glock 23, along with some KCI after market Glock 19 mags. I bought four magazines that came with mag pouches. All four of them worked without a hitch. Not bad for $40 total. I wasn't sure how the 40-9 conversion barrel would perform, but it was FANTASTIC! I just dropped it in and used the Glock 19 mags. I didn't have to change out the ejector or anything else. The barrel was really accurate, and was basically point and shoot. It only cost $99 and I can now shoot lead (sans jacket) bullets without worrying about a KB. I had a lot of fun shooting with my LW 40-9 barrel and went through about 150 rounds in no time. The shots were fired mostly from about 20 feet, but some were at the 5-7 range. I can't wait to have my wife try it out. I recommend this barrel to those who want to save money while practicing, but want to have a .40 cal pistol at the same time.