Jim:
I have just finished firing 500 rounds through an Advantage Arms .22 conversion for my Glock 17 and Glock 22 While not as accurate as my .22 Ruger pistol, it allows me to practice my shooting skills using the same holster and magazine carriers at fraction of what 9mm and .40 cost. More importantly, by using a conversion rather than a different pistol such as the Ruger, I am developing the same muscle memory, skills, and techniques I will use when shooting my service pistol. I chose the Advantage Arms over the Ciener conversion because the slide locks open when the magazine is empty, allowing me to practice my reloading skills. The conversion is well made except for the fragile factory Glock adjustable sights and only comes with one 10 round magazine. They also make conversions for the 1911 style pistols. – Bill N.