Glock magazines come with a very strong spring rate from the factory to ensure reliability in the toughest of conditions. Sometimes, magazines are found to be a little bit difficult to load at first. However, after a few times loading and unloading, the springs break in nicely and it becomes much easier to load. These magazines are designed for use with Glock 32 and 33 pistols. Caliber: .357 SIG Capacity: 13-Round Finish: Black Body Material: Polymer with Steel Insert Base pad: Polymer
