*PLEASE DM BEFORE CHECKING OUT* This mag uses the KWA K120 mags (K120 internals not included) to feed into the airsoft 6mm Proshop FAL and other compatible FALs instead of using stock mags. Some tabs will have to be removed to insert the K120 internals, refer to the picture of the internals or YouTube video linked in the manual provided. Feeds perfectly and is very durable. Magpul friendly.