This magazine performed flawlessly for the first two years of use and thousands of rounds. The design is durable, and they are easy to load all 10 rounds - this is a great little magazine. After about 2 years, it started jamming and failing to feed regularly. Maybe it was a design flaw, but more likely just normal wear and tear from overuse. Make sure you invest in a few extra mags to save yourself the trouble in case yours wear out eventually, too.