|Although the description states that these magazines have a steel liner, they do not. They are 100% polymer with the exception of the spring. Also the finishing leaves a lot to be desired. There are many burrs and build up from the mold.
Additionally, the mags do not drop when released when loaded. With ammo, when the release is pressed the mag moves maybe 1/4". when the mag is empty, they will drop free but with nowhere near as much speed as the oem Glock mags.
To me these would be unacceptable as anything but range plinking toys.|