| The depression is actually the plastic piece attached the the bottom of the spring. It protrudes slightly through a hole in the bottom of the floorplate not visible in this picture. The spring exerts force on that piece which, in turn, exerts a force on two protrusions on the magazine floorplate that lock into the cutout areas on the mag body. The pressure is released on the protrusions when the piece is pressed on, for example, with the nose of a cartridge. |
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