I have used Amend2 magazines in my G19, and I found them to be flawed. They would lock the slide back on the last round, effectively keeping you from actually firing the last round of ammunition. Also, during rapid firing, they would, on occasion, outright fall out from the gun. I tested pmags and glock Oem Mags, and that was never the case during rapid fire. Only the amend2 mags literally fell from my gun. These AR magazines are no exception. The magazines look nice, and they feel nice. Heck, that is why I bought them in the first place. However, when it came to in the field work, they fell short. The only consistent thing I could find about them is that they managed to fail consistently. I really really wanted these magazines to work out. As I said, they look good and feel good. However, it seems as tho the bulk of the design was centered around "looking" good. The "working" good part has definitely come second. I now use them as a "training " magazine for clearing failures and faults. I really wish I could have written a positive review about these. However, it would be against my better judgment to sweeten-up, a clearly subpar magazine.