The magazine is designed for 30 rounds, but it can be reduced to 20 or 10. For this purpose it is enough to reduce the case under the ledge intended for installation of the back cover.
In addition to the rough surface, the outer walls are covered with a tread pattern, which does not lead to slipping in the hands. The magazine is not difficult to disassemble. Sunk in the release button of the back cover, you can easily remove it and get access for cleaning and maintenance.